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Bone Collagen + D3 & K2

youtheory
4.7
★ ★ ★ ★ ★
(655 ratings)
Vitamin K 180 mcg
Collagen 2500 mg
Product Image
Score78
Best suited to adults seeking bone-focused collagen with vitamin D3 and K2; the 2.5 g collagen amount is useful but not large, magnesium is modest, and taking six tablets adds considerable pill burden.
How scoring works
Quantity:180 Tablet(s) • (30 servings)
Goals:
Bone Health
General Health
Heart Health
Anti-Aging
Cardiovascular Support
Skin Health
Nail Health

Score 78

Best suited to adults seeking bone-focused collagen with vitamin D3 and K2; the 2.5 g collagen amount is useful but not large, magnesium is modest, and taking six tablets adds considerable pill burden.
How scoring works
$19.99($0.66 per serving)
iHerb
$ 19.99
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Analysis

Hydrolyzed collagen, vitamin D3, MK-7 vitamin K2, calcium, and magnesium form a coherent bone-support formula. The disclosed amounts make the main contribution reasonably easy to judge.

The 2.5 g collagen amount is useful but not large, magnesium is modest, and taking six tablets adds considerable pill burden. Practical value depends on whether the main active and format match the user’s priority.

The product is best suited to adults seeking bone-focused collagen with vitamin D3 and K2. Benefits for appearance, structure, or wellness should be viewed as nutritional support rather than a guaranteed visible change.

Who is it for
  • Adults seeking bone-focused collagen with vitamin D3 and K2
  • Adults whose diet leaves a gap addressed by the core ingredients
  • Users comfortable with the listed format and serving size
Best for
  • Strong alignment with bone health
  • Uses MK-7 vitamin K2
  • Users who accept that requires six tablets per serving

Pros

  • Strong alignment with bone health
  • Uses MK-7 vitamin K2
  • Provides a useful vitamin D3 amount
  • Includes hydrolyzed collagen and Aquamin calcium

Cons

  • Requires six tablets per serving
  • Magnesium amount is modest
  • Collagen source is not identified
  • Less focused for hair or skin than dedicated beauty collagen

Warnings

  • The 180 mcg vitamin K2 can counteract warfarin and related vitamin K antagonist anticoagulants.
  • Calcium can reduce absorption of levothyroxine and tetracycline or quinolone antibiotics, so doses should be separated.
  • The collagen source is not stated, so users with animal-protein allergies or dietary restrictions should verify the package.

Nutrient quality

90 Highest impact

Vitamin D3, menaquinone-7, magnesium citrate, marine minerals, and hydrolyzed collagen are well-regarded forms, and vitamin D3 and vitamin K2 are meaningful, while calcium and collagen are useful and magnesium is modest. No amount appears excessive for most adults, though vitamin K2 requires attention for warfarin users, while the focused formula avoids low-value extras.

Ingredient transparency

77 High impact

Specific amounts are listed for every supplied active ingredient. No proprietary blend hides active doses, while inactive tablet ingredients are not provided.

Customer satisfaction

71 High impact

The supplied aggregate satisfaction metric is strong, and the feedback volume is sufficient for a reasonably stable aggregate metric. No review excerpts were provided, so recurring complaints and purpose-specific experiences cannot be checked.

Value for money

74 High impact

Strong forms and coherent bone support justify the cost reasonably well. The serving is moderately costly and requires many tablets, while the formula avoids low-value extras.

Report analysis

Goals

Bone Health
Bone Health
Impact
Highest effect
A+ Goal FitA- Strength of SupportA CoverageA Formula Quality
Vitamin K · 180 mcgMagnesium · 20 mgCalcium · 200 mgVitamin D · 50 mcgCollagen · 2500 mg

Vitamin D3, MK-7, calcium, magnesium, and hydrolyzed collagen address mineral supply, calcium handling, and the protein matrix together. The vitamin amounts and named forms make the signaling pathway especially well supported.

Calcium and magnesium are modest, while collagen sits at the lower end of useful supplemental amounts. The collagen source and types are undisclosed, and the mineralized algae blend does not provide full trace-mineral detail.

Study evidence
Calcium Supportive 144 studies
Collagen Supportive 16 studies
Magnesium Supportive 48 studies
Vitamin D Supportive 202 studies
Vitamin K Supportive 78 studies
General Health
General Health
Impact
Highest effect
A Goal FitB Strength of SupportB+ CoverageA- Formula Quality
Vitamin D · 50 mcgMagnesium · 20 mgVitamin K · 180 mcgCollagen · 2500 mg

Vitamin D3, MK-7, calcium, magnesium, and hydrolyzed collagen form a coherent bone and connective-tissue formula. The vitamin D and K amounts are substantial, while collagen reaches a useful lower-end serving.

Calcium and magnesium amounts are modest, and the mineral blend obscures some composition detail. Vitamin K can interfere with warfarin and other vitamin K antagonist medicines, so users of those drugs need clinician-guided consistency.

Study evidence
Collagen Supportive 31 studies
Magnesium Supportive 114 studies
Vitamin D Supportive 115 studies
Vitamin K Supportive 34 studies
Heart Health
Heart Health
Impact
Highest effect
A- Goal FitA Strength of SupportB CoverageC+ Formula Quality
Vitamin K · 180 mcgMagnesium · 20 mgVitamin D · 50 mcg

Vitamin K2 as MK-7 and vitamin D3 form a relevant calcium-management pair for vascular resilience. Both are supplied at meaningful, clearly stated amounts.

The six-tablet serving is dominated by collagen and bone-support minerals rather than cardiovascular actives. Vitamin K2 can oppose warfarin and other vitamin K antagonists, so people using those medicines should not add this product without prescriber guidance.

Study evidence
Magnesium Supportive 158 studies
Vitamin D Mixed 164 studies
Vitamin K Mixed 62 studies
Anti-Aging
Anti-Aging
Impact
Highest effect
B+ Goal FitC+ Strength of SupportB+ CoverageA Formula Quality
Magnesium · 20 mgVitamin K · 180 mcgVitamin D · 50 mcgCollagen · 2500 mg

Collagen, vitamin D3, MK-7, calcium, and magnesium create a broad bone-and-connective-tissue formula. Human evidence is most relevant to skin, connective tissue, and joint function rather than cellular aging.

Collagen sits at the lower useful boundary, while D3 and MK-7 are meaningfully dosed. Vitamin K can counteract warfarin and other vitamin K antagonist anticoagulants, so medicine dosing requires clinician-guided consistency.

Study evidence
Collagen Supportive 33 studies
Magnesium Supportive 12 studies
Vitamin D Supportive 50 studies
Vitamin K Supportive 27 studies
Cardiovascular Support
Cardiovascular Support
Impact
High effect
C+ Goal FitA Strength of SupportC- CoverageB- Formula Quality
Vitamin K · 180 mcgMagnesium · 20 mgVitamin D · 50 mcg

Vitamin K2 as MK-7 and vitamin D3 form a logical calcium-management pairing that may support arterial health. The K2 amount is meaningful, although cardiovascular outcome evidence is less direct than for established lipid or blood-pressure interventions.

Collagen, calcium, and sea minerals reflect the product’s primary bone focus and add limited heart-specific value. Vitamin K2 can counteract warfarin and other vitamin K antagonist anticoagulants, so users of these medicines need clinician-guided consistency.

Study evidence
Vitamin K Supportive 40 studies
Skin Health
Skin Health
Impact
High effect
B+ Goal FitB Strength of SupportC CoverageC- Formula Quality
Collagen · 2500 mg

Hydrolyzed collagen provides direct structural skin support at the low end of useful intake. Vitamin D3, vitamin K2, and minerals make the formula more focused on bone than skin.

The collagen source and types are not disclosed, and no vitamin C or direct hydration active is included. Vitamin K2 can interfere with warfarin and related vitamin K antagonists, so users of those medicines need clinician-guided consistency.

Study evidence
Collagen Supportive 62 studies

Ingredients

IngredientAmount per serving
Vitamin D3 (Cholecalciferol)
 50 mcg
Vitamin K2 (Menaquinone-7)
 180 mcg
Calcium (Aquamin)
 200 mg
Magnesium (Aquamin Sea Minerals, Magnesium Citrate)
 20 mg
hydrolyzed Collagen
2500 mg
Aquamin Sea Minerals (mineralized Red Algae)
 666 mg
Adults 18–50 Women
Report overview
Vitamin K (Menaquinone-7) · 180 mcg OverallScore77
C+ Active Ingredient Quality & BioavailabilityA+ Dose, Safety & Label TransparencyD+ Value

The formula uses a well-aligned MK-7 amount and pairs it with vitamin D3, calcium, magnesium, and collagen for a bone-focused blend. Generic MK-7 sourcing, a dry tablet format without fat-containing meal guidance, and a six-tablet serving are meaningful drawbacks. Vitamin K can counteract warfarin and other vitamin K antagonist anticoagulants, so users of these medicines need clinician-guided consistency.

View ingredientView products
Collagen · 2500 mg OverallScore48
D+ Active Ingredient Quality & BioavailabilityF Dose, Safety & Label TransparencyB- Value

Hydrolyzed collagen provides an absorbable form at the lower end of amounts used for skin-focused support. Neither the source and types nor a branded collagen identity are provided, and composition cannot be checked against protein or amino acid data. Cost per gram is moderate rather than exceptionally low.

View ingredientView products
Loading alternative details
87 Performance

Vitamin D3 25 mcg (1000 IU) & K2 120 mcg

Natural Factors
<p>Moderate vitamin D3 and a meaningful MK-7 amount create a balanced maintenance formula with a simpler softgel serving. It offers stronger D3-and-K2 focus than the original, though collagen, calcium, and magnesium are absent.</p>
84 Performance

Super Collagen 6000 mg plus Vitamin C

21st Century
<p>Six grams of hydrolyzed collagen with buffered vitamin C provides much stronger collagen support than the original. Missing collagen-source details and the absence of vitamin D3, K2, calcium, and magnesium narrow it to structural support rather than complete bone coverage.</p>
85 Performance

Collagen Skin Renewal

Natrol
<p>Verisol collagen peptides are paired with vitamin C at a recognized skin-focused amount, improving the collagen side of the formula. Animal source and collagen type are not supplied, while the original remains broader for bone health because it also includes D3, K2, calcium, and magnesium.</p>
86 Budget

Vitamin K2 100 mcg + Vitamin D3 125 mcg

Nutricost
<p>A softgel combines a meaningful MK-7 amount with concentrated vitamin D3 at a much lower serving cost. It omits calcium, magnesium, and collagen, and the high vitamin D amount should be considered alongside other sources.</p>
87 Budget

Collagen + C 2500 mg

Spring Valley
<p>Branded collagen and vitamin C provide focused structural support at a lower serving cost. The formula lacks vitamin D3, vitamin K2, calcium, and magnesium, so it does not replace the original's broader bone-support coverage.</p>
85 Budget

Vitamin K2 MenaQ7 100 mcg

AN Amazing Nutrition Amazing Formulas
<p>Natto-derived MK-7 offers a focused vitamin K2 option with excellent label clarity and a lower recurring cost. It leaves out vitamin D3, minerals, and collagen, and vitamin K requires clinician-directed use with warfarin-type medicines.</p>
86 Value

Liquid D-3 & MK-7

NOW
<p>MK-7 and a substantial vitamin D3 amount provide focused bone support with convenient liquid dosing and strong serving value. Collagen and structural minerals are missing, and vitamin K can conflict with warfarin-type medicines.</p>
85 Value

Collagen 6000 mg

youtheory
<p>Six grams of hydrolyzed collagen with vitamin C offers considerably more collagen at a lower recurring cost. The six-tablet serving remains cumbersome and the formula omits vitamin D3, K2, calcium, and magnesium.</p>
86 Value

Vitamins D3 2500 IU (62.5 mcg) & K2 120 mcg

NaturesPlus
<p>MK-7 and substantial vitamin D3 provide focused bone and cardiovascular support at a very low serving cost. The dry tablet lacks a lipid carrier, while collagen, calcium, and magnesium are not included.</p>
Report alternatives

Sources

Published studies used for the product analysis and the top-ranked studies for each ingredient and goal.

  1. Three-year low-dose menaquinone-7 supplementation helps decrease bone loss in healthy postmenopausal women.
    Knapen MH; Drummen NE; Smit E; Vermeer C; Theuwissen E · Osteoporosis international : a journal established as result of cooperation between the European Foundation for Osteoporosis and the National Osteoporosis Foundation of the USA · 2014
    Randomized trial244 participantsBone Health forVitamin K
  2. Comparison of concurrent treatment with vitamin K2 and risedronate compared with treatment with risedronate alone in patients with osteoporosis: Japanese Osteoporosis Intervention Trial-03.
    Tanaka S; Miyazaki T; Uemura Y; Miyakawa N; Gorai I; Nakamura T; Fukunaga M; Ohashi Y; Ohta H; Mori S; Hagino H; Hosoi T; Sugimoto T; Itoi E; Orimo H; Shiraki M · Journal of bone and mineral metabolism · 2018
    Randomized trial1,874 participantsBone Health forVitamin K
  3. Vitamin K supplementation in postmenopausal women with osteopenia (ECKO trial): a randomized controlled trial.
    Cheung AM; Tile L; Lee Y; Tomlinson G; Hawker G; Scher J; Hu H; Vieth R; Thompson L; Jamal S; Josse R · PLoS medicine · 2009
    Randomized trial440 participantsBone Health forVitamin K
  4. Effect of Calcium and Vitamin D Supplementation With and Without Collagen Peptides on Volumetric and Areal Bone Mineral Density, Bone Geometry and Bone Turnover in Postmenopausal Women With Osteopenia.
    Lampropoulou-Adamidou K; Karlafti E; Argyrou C; Makris K; Trovas G; Dontas IA; Tournis S; Triantafyllopoulos IK · Journal of clinical densitometry : the official journal of the International Society for Clinical Densitometry · 2022
    Randomized trial51 participantsBone Health forCollagen
  5. The Role of Collagen Supplementation in Bone Metabolism and Structure: A Scoping Review.
    Kuhlman NM; Jagim AR; Blesso C; Jones MT; Chun O; Puglisi M; Fields JB · Clinical journal of sport medicine : official journal of the Canadian Academy of Sport Medicine · 2026
    Scoping review15 studies pooledBone Health forCollagen
  6. Specific Collagen Peptides Improve Bone Mineral Density and Bone Markers in Postmenopausal Women-A Randomized Controlled Study.
    König D; Oesser S; Scharla S; Zdzieblik D; Gollhofer A · Nutrients · 2018
    Randomized trial131 participantsBone Health forCollagen
  7. Effects of collagen-based supplements on skin's hydration and elasticity: A systematic review and meta-analysis.
    Danessa G; Notario D; Regina R · Indian journal of dermatology, venereology and leprology · 2025
    Meta-analysis646 participants10 studies pooledSkin Health forCollagen
  8. Efficacy and Safety of Topical or Oral Hydrolyzed Collagen in Women with Dermatoporosis: A Randomized, Double-Blind, Factorial Design Study.
    Guadanhim LRS; Miot HA; Soares JLM; Silva SAM; Leonardi GR; Lopes RD; Bagatin E · Dermatology and therapy · 2023
    Randomized trial56 participantsSkin Health forCollagen
  9. Effects of Oral Collagen for Skin Anti-Aging: A Systematic Review and Meta-Analysis.
    Pu SY; Huang YL; Pu CM; Kang YN; Hoang KD; Chen KH; Chen C · Nutrients · 2023
    Meta-analysis1,721 participants26 studies pooledSkin Health forCollagen
  10. Oral intake of collagen peptide NS improves hydration, elasticity, desquamation, and wrinkling in human skin: a randomized, double-blinded, placebo-controlled study.
    Lee M; Kim E; Ahn H; Son S; Lee H · Food & function · 2023
    Randomized trial100 participantsAnti-Aging Skin Health forCollagen
  11. Effects of hydrolyzed collagen supplementation on skin aging: a systematic review and meta-analysis.
    de Miranda RB; Weimer P; Rossi RC · International journal of dermatology · 2021
    Meta-analysis1,125 participants19 studies pooledAnti-Aging Skin Health forCollagen
  12. Oral supplementation of specific collagen peptides has beneficial effects on human skin physiology: a double-blind, placebo-controlled study.
    Proksch E; Segger D; Degwert J; Schunck M; Zague V; Oesser S · Skin pharmacology and physiology · 2014
    Randomized trial69 participantsAnti-Aging forCollagen
  13. Skin Anti-Aging and Moisturizing Effects of Low-Molecular-Weight Collagen Peptide Supplementation in Healthy Adults: A Randomized, Double-Blind, Placebo-Controlled Clinical Trial.
    Lee E; Ahn DK; Kim JH; Lee S; Kim HJ; Lee HK; Shin JH · Journal of microbiology and biotechnology · 2025
    Randomized trial70 participantsAnti-Aging forCollagen
  14. Oral intake of specific bioactive collagen peptides reduces skin wrinkles and increases dermal matrix synthesis.
    Proksch E; Schunck M; Zague V; Segger D; Degwert J; Oesser S · Skin pharmacology and physiology · 2014
    Randomized trial114 participantsAnti-Aging forCollagen
  15. Dietary Magnesium May Be Protective for Aging of Bone and Skeletal Muscle in Middle and Younger Older Age Men and Women: Cross-Sectional Findings from the UK Biobank Cohort.
    Welch AA; Skinner J; Hickson M · Nutrients · 2018
    Cross-sectional study156,575 participantsAnti-Aging forMagnesium
  16. Higher Magnesium Intake Is Associated with a Lower Risk of Frailty in Older Adults.
    Dominguez LJ; Mérida DM; Donat-Vargas C; Banegas JR; Veronese N; Barbagallo M; Rodríguez-Artalejo F; Guallar-Castillón P · Journal of the American Medical Directors Association · 2024
    Cohort study1,900 participantsAnti-Aging forMagnesium
  17. Ca:Mg Ratio, APOE Cytosine Modifications, and Cognitive Function: Results from a Randomized Trial.
    Zhu X; Borenstein AR; Zheng Y; Zhang W; Seidner DL; Ness R; Murff HJ; Li B; Shrubsole MJ; Yu C; Hou L; Dai Q · Journal of Alzheimer's disease : JAD · 2021
    Randomized trial250 participantsAnti-Aging forMagnesium
  18. The Association between Dietary Nutrient Intake and Acceleration of Aging: Evidence from NHANES.
    Ma J; Li P; Jiang Y; Yang X; Luo Y; Tao L; Guo X; Gao B · Nutrients · 2024
    Cross-sectional study4,692 participantsAnti-Aging forMagnesium
  19. Interpretable machine learning with SHAP analysis identifies redox-modulating dietary antioxidants for predicting accelerated biological aging.
    Zhang B; Zhang X; Ma L; Li D; Li Y; Lin S; Peng L; He L · Experimental gerontology · 2026
    Cross-sectional study8,125 participantsAnti-Aging forMagnesium
  20. Joint association of serum 25-hydroxyvitamin D concentration and body mass index on the acceleration of clinical biomarker-based biological aging.
    Pan Z; Zeng J; Chen Z; Chen S; Yang J; Li H; Wang S; Wang J; Li N; Gong Y; Liu M; Li C · The journals of gerontology. Series A, Biological sciences and medical sciences · 2026
    Cohort study389,217 participantsAnti-Aging forVitamin D
  21. Serum 25-Hydroxyvitamin D Levels as an Aging Marker: Strong Associations With Age and All-Cause Mortality Independent From Telomere Length, Epigenetic Age Acceleration, and 8-Isoprostane Levels.
    Schöttker B; Hagen L; Zhang Y; Gào X; Holleczek B; Gao X; Brenner H · The journals of gerontology. Series A, Biological sciences and medical sciences · 2019
    Cohort study9,940 participantsAnti-Aging forVitamin D
  22. Sex-specific associations of serum 25-hydroxyvitamin D concentrations with incident sarcopenia in older adults: A 2-year follow-up study.
    Song S; Lim JY; Kim M; Won CW; Park HY · The journal of nutrition, health & aging · 2025
    Cohort study1,292 participantsAnti-Aging forVitamin D
  23. Vitamin D deficit is associated with accelerated brain aging in the general population.
    Terock J; Bonk S; Frenzel S; Wittfeld K; Garvert L; Hosten N; Nauck M; Völzke H; Van der Auwera S; Grabe HJ · Psychiatry research. Neuroimaging · 2022
    Cross-sectional study1,865 participantsAnti-Aging forVitamin D
  24. Vitamin D intake is associated with dementia risk in the Washington Heights-Inwood Columbia Aging Project (WHICAP).
    Zhao C; Tsapanou A; Manly J; Schupf N; Brickman AM; Gu Y · Alzheimer's & dementia : the journal of the Alzheimer's Association · 2021
    Cohort study1,759 participantsAnti-Aging forVitamin D
  25. Vitamin K status, cardiovascular disease, and all-cause mortality: a participant-level meta-analysis of 3 US cohorts.
    Shea MK; Barger K; Booth SL; Matuszek G; Cushman M; Benjamin EJ; Kritchevsky SB; Weiner DE · The American journal of clinical nutrition · 2020
    Meta-analysis3,891 participants3 studies pooledAnti-Aging General Health forVitamin K
  26. Topical Menaquinone‑7 (Vitamin K2, MK-7) as a Mitochondrial Bioenergetic Activator for Skin Anti-Aging: Mechanistic Evidence in Skin Cells and a Randomized Split-Face/Neck Study.
    Huang H; Wei R; Xu C; Liu C; Zhao S; Li Y; Wang M · ACS omega · 2026
    Randomized trial30 participantsAnti-Aging forVitamin K
  27. Vitamin K status and cognitive function in healthy older adults.
    Presse N; Belleville S; Gaudreau P; Greenwood CE; Kergoat MJ; Morais JA; Payette H; Shatenstein B; Ferland G · Neurobiology of aging · 2014
    Cross-sectional study320 participantsAnti-Aging forVitamin K
  28. High dephospho-uncarboxylated matrix Gla protein concentrations, a plasma biomarker of vitamin K, in relation to frailty: the Longitudinal Aging Study Amsterdam.
    Machado-Fragua MD; Hoogendijk EO; Struijk EA; Rodriguez-Artalejo F; Lopez-Garcia E; Beulens JW; van Ballegooijen AJ · European journal of nutrition · 2021
    Cohort study644 participantsAnti-Aging forVitamin K
  29. Vitamin K Concentration and Cognitive Status in Elderly Patients on Anticoagulant Therapy: A Pilot Study.
    Alisi L; Cafolla C; Gentili A; Tartaglione S; Curini R; Cafolla A · Journal of aging research · 2022
    Cross-sectional study85 participantsAnti-Aging forVitamin K
  30. What is the impact of daily oral supplementation of vitamin D3 (cholecalciferol) plus calcium on the incidence of hip fracture in older people? A systematic review and meta-analysis.
    Manoj P; Derwin R; George S · International journal of older people nursing · 2023
    Meta-analysis12,620 participants7 studies pooledBone Health forCalcium
  31. Calcium supplementation prevents seasonal bone loss and changes in biochemical markers of bone turnover in elderly New England women: a randomized placebo-controlled trial.
    Storm D; Eslin R; Porter ES; Musgrave K; Vereault D; Patton C; Kessenich C; Mohan S; Chen T; Holick MF; Rosen CJ · The Journal of clinical endocrinology and metabolism · 1998
    Randomized trial60 participantsBone Health forCalcium
  32. The effects of calcium supplementation (milk powder or tablets) and exercise on bone density in postmenopausal women.
    Prince R; Devine A; Dick I; Criddle A; Kerr D; Kent N; Price R; Randell A · Journal of bone and mineral research : the official journal of the American Society for Bone and Mineral Research · 1995
    Randomized trial168 participantsBone Health forCalcium
  33. The efficacy of calcium supplementation alone in elderly Thai women over a 2-year period: a randomized controlled trial.
    Rajatanavin R; Chailurkit L; Saetung S; Thakkinstian A; Nimitphong H · Osteoporosis international : a journal established as result of cooperation between the European Foundation for Osteoporosis and the National Osteoporosis Foundation of the USA · 2014
    Randomized trial404 participantsBone Health forCalcium
  34. Calcium-enriched foods and bone mass growth in prepubertal girls: a randomized, double-blind, placebo-controlled trial.
    Bonjour JP; Carrie AL; Ferrari S; Clavien H; Slosman D; Theintz G; Rizzoli R · The Journal of clinical investigation · 1997
    Randomized trial149 participantsBone Health forCalcium
  35. Bone turnover and bone collagen maturation in osteoporosis: effects of antiresorptive therapies.
    Byrjalsen I; Leeming DJ; Qvist P; Christiansen C; Karsdal MA · Osteoporosis international : a journal established as result of cooperation between the European Foundation for Osteoporosis and the National Osteoporosis Foundation of the USA · 2008
    Randomized trialBone Health forCollagen
  36. A calcium-collagen chelate dietary supplement attenuates bone loss in postmenopausal women with osteopenia: a randomized controlled trial.
    Elam ML; Johnson SA; Hooshmand S; Feresin RG; Payton ME; Gu J; Arjmandi BH · Journal of medicinal food · 2015
    Randomized trial39 participantsBone Health forCollagen
  37. Assessment of Osteoporosis in Lumbar Spine: In Vivo Quantitative MR Imaging of Collagen Bound Water in Trabecular Bone.
    Liu J; Liao JW; Li W; Chen XJ; Feng JX; Yao L; Huang PH; Su ZH; Lu H; Liao YT; Li SL; Ma YJ · Frontiers in endocrinology · 2022
    Methods validation study189 participantsBone Health forCollagen
  38. Effect of calcium and vitamin D supplementation with and without collagen peptides on bone turnover in postmenopausal women with osteopenia.
    Argyrou C; Karlafti E; Lampropoulou-Adamidou K; Tournis S; Makris K; Trovas G; Dontas I; Triantafyllopoulos IK · Journal of musculoskeletal & neuronal interactions · 2021
    Randomized trial51 participantsBone Health forCollagen
  39. Association between Serum Magnesium and Fractures: A Systematic Review and Meta-Analysis of Observational Studies.
    Dominguez LJ; Veronese N; Ciriminna S; Pérez-Albela JL; Vásquez-López VF; Rodas-Regalado S; Di Bella G; Parisi A; Tagliaferri F; Barbagallo M · Nutrients · 2023
    Meta-analysis119,755 participants4 studies pooledBone Health forMagnesium
  40. Bioabsorbable Magnesium-Based Materials Potential and Safety in Bone Surgery: A Systematic Review.
    Hung CH; Kwok YC; Yip J; Wong HH; Leung YY · Craniomaxillofacial trauma & reconstruction · 2025
    Systematic review386 participants8 studies pooledBone Health forMagnesium
  41. Vascularized bone grafting fixed by biodegradable magnesium screw for treating osteonecrosis of the femoral head.
    Zhao D; Huang S; Lu F; Wang B; Yang L; Qin L; Yang K; Li Y; Li W; Wang W; Tian S; Zhang X; Gao W; Wang Z; Zhang Y; Xie X; Wang J; Li J · Biomaterials · 2016
    Randomized trial48 participantsBone Health forMagnesium
  42. An update on magnesium and bone health.
    Rondanelli M; Faliva MA; Tartara A; Gasparri C; Perna S; Infantino V; Riva A; Petrangolini G; Peroni G · Biometals : an international journal on the role of metal ions in biology, biochemistry, and medicine · 2022
    Narrative reviewBone Health forMagnesium
  43. Sex-specific differences in the association of magnesium intake with femoral neck bone mineral density among older adults.
    Wang B; Tan X; Yao X; Zhu Z · Endocrine connections · 2025
    Cross-sectional study1,343 participantsBone Health forMagnesium
  44. Pregnancy vitamin D supplementation and offspring bone mineral density in childhood follow-up of a randomized controlled trial.
    Moon RJ; D' Angelo S; Curtis EM; Ward KA; Crozier SR; Schoenmakers I; Javaid MK; Bishop NJ; Godfrey KM; Cooper C; Harvey NC; MAVIDOS Trial Group · The American journal of clinical nutrition · 2024
    Randomized trial454 participantsBone Health forVitamin D
  45. Vitamin D analogs and bone: preclinical and clinical studies with eldecalcitol.
    Matsumoto T; Takano T; Saito H; Takahashi F · BoneKEy reports · 2014
    Narrative reviewBone Health forVitamin D
  46. Efficacy of vitamin D fortified foods on bone mineral density and serum bone biomarkers: A systematic review and meta-analysis of interventional studies.
    Tangestani H; Djafarian K; Emamat H; Arabzadegan N; Shab-Bidar S · Critical reviews in food science and nutrition · 2020
    Meta-analysis1,786 participants20 studies pooledBone Health forVitamin D
  47. Cholecalciferol Supplementation Attenuates Bone Loss in Incident Kidney Transplant Recipients: A Prespecified Secondary Endpoint Analysis of a Randomized Controlled Trial.
    Tsujita M; Doi Y; Obi Y; Hamano T; Tomosugi T; Futamura K; Okada M; Hiramitsu T; Goto N; Isaka Y; Takeda A; Narumi S; Watarai Y · Journal of bone and mineral research : the official journal of the American Society for Bone and Mineral Research · 2022
    Randomized trial193 participantsBone Health forVitamin D
  48. Vitamin D supplementation and bone health in post-menopausal women: a 24-month randomized controlled intervention with enhanced bioavailability formulations.
    Rasool N; Munir Y · European journal of clinical nutrition · 2026
    Randomized trial612 participantsBone Health forVitamin D
  49. Vitamin K and the prevention of fractures: systematic review and meta-analysis of randomized controlled trials.
    Cockayne S; Adamson J; Lanham-New S; Shearer MJ; Gilbody S; Torgerson DJ · Archives of internal medicine · 2006
    Meta-analysis13 studies pooledBone Health forVitamin K
  50. Effect of combined administration of vitamin D3 and vitamin K2 on bone mineral density of the lumbar spine in postmenopausal women with osteoporosis.
    Iwamoto J; Takeda T; Ichimura S · Journal of orthopaedic science : official journal of the Japanese Orthopaedic Association · 2001
    Randomized trial92 participantsBone Health forVitamin K
  51. Efficacy and safety of vitamin K2 for postmenopausal women with osteoporosis at a long-term follow-up: meta-analysis and systematic review.
    Zhou M; Han S; Zhang W; Wu D · Journal of bone and mineral metabolism · 2022
    Meta-analysis6,853 participants9 studies pooledBone Health forVitamin K
  52. Low-dose vitamin K2 (MK-4) supplementation for 12 months improves bone metabolism and prevents forearm bone loss in postmenopausal Japanese women.
    Koitaya N; Sekiguchi M; Tousen Y; Nishide Y; Morita A; Yamauchi J; Gando Y; Miyachi M; Aoki M; Komatsu M; Watanabe F; Morishita K; Ishimi Y · Journal of bone and mineral metabolism · 2015
    Randomized trial48 participantsBone Health forVitamin K
  53. Vitamin K Intake and Atherosclerotic Cardiovascular Disease in the Danish Diet Cancer and Health Study.
    Bellinge JW; Dalgaard F; Murray K; Connolly E; Blekkenhorst LC; Bondonno CP; Lewis JR; Sim M; Croft KD; Gislason G; Torp-Pedersen C; Tjønneland A; Overvad K; Hodgson JM; Schultz C; Bondonno NP · Journal of the American Heart Association · 2021
    Cohort study53,372 participantsCardiovascular Support Heart Health forVitamin K
  54. Menaquinone-7 supplementation improves arterial stiffness in healthy postmenopausal women. A double-blind randomised clinical trial.
    Knapen MH; Braam LA; Drummen NE; Bekers O; Hoeks AP; Vermeer C · Thrombosis and haemostasis · 2016
    Randomized trial244 participantsCardiovascular Support Heart Health forVitamin K
  55. Effects of One-Year Menaquinone-7 Supplementation on Vascular Stiffness and Blood Pressure in Post-Menopausal Women.
    de Vries F; Bittner R; Maresz K; Machuron F; Gåserød O; Jeanne JF; Schurgers LJ · Nutrients · 2025
    Randomized trial165 participantsCardiovascular Support forVitamin K
  56. Dietary Vitamin K1 Intake and Incident Aortic Valve Stenosis.
    Schultz CJ; Dalgaard F; Bellinge JW; Murray K; Sim M; Connolly E; Blekkenhorst LC; Bondonno CP; Lewis JR; Gislason GH; Tjønneland A; Overvad K; Hodgson JM; Bondonno NP · Arteriosclerosis, thrombosis, and vascular biology · 2024
    Cohort study55,545 participantsCardiovascular Support Heart Health forVitamin K
  57. Association between vitamin K1 intake and mortality in the Danish Diet, Cancer, and Health cohort.
    Palmer CR; Bellinge JW; Dalgaard F; Sim M; Murray K; Connolly E; Blekkenhorst LC; Bondonno CP; Croft KD; Gislason G; Tjønneland A; Overvad K; Schultz C; Lewis JR; Hodgson JM; Bondonno NP · European journal of epidemiology · 2021
    Cohort study56,048 participantsCardiovascular Support Heart Health forVitamin K
  58. A double-blind, placebo-controlled, randomised, clinical study on the effectiveness of collagen peptide on osteoarthritis.
    Kumar S; Sugihara F; Suzuki K; Inoue N; Venkateswarathirukumara S · Journal of the science of food and agriculture · 2015
    Randomized trialGeneral Health forCollagen
  59. Efficacy and safety of native type II collagen in modulating knee osteoarthritis symptoms: a randomised, double-blind, placebo-controlled trial.
    Luo C; Su W; Song Y; Srivastava S · Journal of experimental orthopaedics · 2023
    Randomized trial101 participantsGeneral Health forCollagen
  60. Healing Process, Pain, and Health-Related Quality of Life in Patients with Venous Leg Ulcers Treated with Fish Collagen Gel: A 12-Week Randomized Single-Center Study.
    Mościcka P; Cwajda-Białasik J; Szewczyk MT; Jawień A · International journal of environmental research and public health · 2022
    Randomized trial100 participantsGeneral Health forCollagen
  61. Efficacy and Safety of Dietary Undenatured Type II Collagen on Joint and Motor Function in Healthy Volunteers: A Randomized, Double-Blind, Placebo-Controlled, Parallel-Group Study.
    Shiojima Y; Takahashi M; Takahashi R; Maruyama K; Moriyama H; Bagchi D; Bagchi M; Akanuma M · Journal of the American Nutrition Association · 2023
    Randomized trial64 participantsGeneral Health forCollagen
  62. The use of a collagen matrix in hard-to-heal venous leg ulcers.
    Romanelli M; Mulder G; Paggi B; Macchia M; Panduri S; Dini V · Journal of wound care · 2016
    Randomized trial40 participantsGeneral Health forCollagen
  63. Perioperative systemic magnesium to minimize postoperative pain: a meta-analysis of randomized controlled trials.
    De Oliveira GS; Castro-Alves LJ; Khan JH; McCarthy RJ · Anesthesiology · 2013
    Meta-analysis1,257 participants20 studies pooledGeneral Health forMagnesium
  64. Long-term outcome after intravenous magnesium sulphate in suspected acute myocardial infarction: the second Leicester Intravenous Magnesium Intervention Trial (LIMIT-2).
    Woods KL; Fletcher S · Lancet (London, England) · 1994
    Randomized trial2,316 participantsGeneral Health forMagnesium
  65. Association of magnesium sulfate use with mortality in critically ill patients with sepsis: a retrospective propensity score-matched cohort study.
    Gu WJ; Duan XJ; Liu XZ; Cen Y; Tao LY; Lyu J; Yin HY · British journal of anaesthesia · 2023
    Cohort study10,999 participantsGeneral Health forMagnesium
  66. Hypomagnesemia and Mortality in Incident Hemodialysis Patients.
    Li L; Streja E; Rhee CM; Mehrotra R; Soohoo M; Brunelli SM; Kovesdy CP; Kalantar-Zadeh K · American journal of kidney diseases : the official journal of the National Kidney Foundation · 2016
    Cohort study9,359 participantsGeneral Health forMagnesium
  67. The effects of magnesium supplementation on abnormal uterine bleeding, alopecia, quality of life, and acne in women with polycystic ovary syndrome: a randomized clinical trial.
    Jaripur M; Ghasemi-Tehrani H; Askari G; Gholizadeh-Moghaddam M; Clark CCT; Rouhani MH · Reproductive biology and endocrinology : RB&E · 2022
    Randomized trial64 participantsGeneral Health forMagnesium
  68. Vitamin D supplementation for prevention of mortality in adults.
    Bjelakovic G; Gluud LL; Nikolova D; Whitfield K; Wetterslev J; Simonetti RG; Bjelakovic M; Gluud C · The Cochrane database of systematic reviews · 2014
    Meta-analysis95,286 participants159 studies pooledGeneral Health forVitamin D
  69. Effect of vitamin D on gastrointestinal symptoms and health-related quality of life in irritable bowel syndrome patients: a randomized double-blind clinical trial.
    Abbasnezhad A; Amani R; Hajiani E; Alavinejad P; Cheraghian B; Ghadiri A · Neurogastroenterology and motility · 2018
    Randomized trial90 participantsGeneral Health forVitamin D
  70. The impact of vitamin D administration on mortality in COVID-19 patients: a systematic review and meta-analysis of randomized controlled trials.
    Kow CS; Ramachandram DS; Hasan SS; Wong Z; Thiruchelvam K · Inflammopharmacology · 2024
    Meta-analysis2,495 participants19 studies pooledGeneral Health forVitamin D
  71. Vitamin D Status and Mortality: A Systematic Review of Observational Studies.
    Heath AK; Kim IY; Hodge AM; English DR; Muller DC · International journal of environmental research and public health · 2019
    Systematic review84 studies pooledGeneral Health forVitamin D
  72. Meta-analysis of long-term vitamin D supplementation on overall mortality.
    Zheng Y; Zhu J; Zhou M; Cui L; Yao W; Liu Y · PloS one · 2014
    Meta-analysis42 studies pooledGeneral Health forVitamin D
  73. Dietary vitamin K intake associates with reduced all-cause mortality in non-alcoholic fatty liver disease patients.
    Huang Y; Zhu X; Han L; Hu H · Scientific reports · 2025
    Cohort study7,857 participantsGeneral Health forVitamin K
  74. The Effect of Topical Vitamin K1 on the Treatment of Cetuximab-Induced Skin Rashes in Metastatic Colorectal Cancer Patients.
    Roayaei M; Rezaei M; Najafizade N · Advanced biomedical research · 2024
    Randomized trial49 participantsGeneral Health forVitamin K
  75. Effect of vitamin K on improving post‑kidney transplant outcomes: a meta‑analysis.
    Sun Z; Zhu K; Liang G; Yan F; Chao S; Jia L; Niu Y · Experimental and therapeutic medicine · 2023
    Meta-analysis7 studies pooledGeneral Health forVitamin K
  76. Vitamin K1 intake is associated with lower risk for all-cause and cardiovascular disease mortality in community-dwelling older Australian women.
    Dupuy M; Radavelli-Bagatini S; Zhong L; Dalla Via J; Zhu K; Blekkenhorst LC; Bondonno NP; Linneberg A; Bellinge JW; Schultz C; Courtney W; Prince RL; Hodgson JM; Lewis JR; Sim M · Nutrition, metabolism, and cardiovascular diseases : NMCD · 2024
    Cohort study1,436 participantsGeneral Health forVitamin K
  77. Low-Molecular-Weight Collagen Peptide Supplementation Improves Cellulite Severity, Skin Elasticity, and Hair Shaft Diameter: A Clinical Study with Pharmacokinetic Evaluation.
    Hwang S; Won J; Kim S; Kang W; Park M · Journal of medicinal food · 2026
    Randomized trial114 participantsHair Health forCollagen
  78. Calcium and Vitamin D Supplementation with and Without Collagen on Bone Density and Skin Elasticity in Menopausal Women-A Randomized Controlled Study.
    Duangjai A; Srivilai J; Nangola S; Amornlerdpison D · Clinics and practice · 2025
    Randomized trialHair Health forCollagen
  79. Dietary Collagen Supplementation as a Strategy for Skin Health: A Narrative Review of Clinical Effects on Skin, Hair, Nails, and Wound Healing.
    Biełach-Bazyluk A; Jurga M; Flisiak I; Zbroch E · Nutrients · 2026
    Narrative reviewHair Health forCollagen
  80. Increased prevalence of vitamin D deficiency in patients with alopecia areata: a systematic review and meta-analysis.
    Lee S; Kim BJ; Lee CH; Lee WS · Journal of the European Academy of Dermatology and Venereology : JEADV · 2018
    Meta-analysis2,039 participants14 studies pooledHair Health forVitamin D
  81. Intralesional vitamin D3 in treatment of alopecia areata: A randomized controlled clinical trial.
    Rashad AF; Elgamal E; Fouda I · Journal of cosmetic dermatology · 2022
    Randomized trial60 participantsHair Health forVitamin D
  82. Vitamin D and its Analogs in Treatment of Mild to Moderate Alopecia Areata: Systematic Review and Meta-Analysis.
    Alsaati AA; Kaliyadan F; Alsaadoun D; Alzakry LM; Alzabadin RA; Hakami TH; Rubaian NFB · Indian dermatology online journal · 2025
    Meta-analysisHair Health forVitamin D
  83. Topical calcipotriol vs narrowband ultraviolet B in treatment of alopecia areata: a randomized-controlled trial.
    El Taieb MA; Hegazy EM; Ibrahim HM; Osman AB; Abualhamd M · Archives of dermatological research · 2020
    Randomized trial60 participantsHair Health forVitamin D
  84. Serum 25 hydroxyvitamin D in non-scarring alopecia: A systematic review and meta-analysis.
    Chen Y; Dong X; Wang Y; Li Y; Xiong L; Li L · Journal of cosmetic dermatology · 2024
    Meta-analysis10,670 participants23 studies pooledHair Health forVitamin D
  85. Quantitative Association Between Serum/Dietary Magnesium and Cardiovascular Disease/Coronary Heart Disease Risk: A Dose-Response Meta-analysis of Prospective Cohort Studies.
    Zhao L; Hu M; Yang L; Xu H; Song W; Qian Y; Zhao M · Journal of cardiovascular pharmacology · 2020
    Meta-analysis544,581 participants18 studies pooledHeart Health forMagnesium
  86. Effects of magnesium supplementation on improving hyperglycemia, hypercholesterolemia, and hypertension in type 2 diabetes: A pooled analysis of 24 randomized controlled trials.
    Xu L; Li X; Wang X; Xu M · Frontiers in nutrition · 2023
    Meta-analysis1,325 participants24 studies pooledHeart Health forMagnesium
  87. The effect of lowering blood pressure by magnesium supplementation in diabetic hypertensive adults with low serum magnesium levels: a randomized, double-blind, placebo-controlled clinical trial.
    Guerrero-Romero F; Rodríguez-Morán M · Journal of human hypertension · 2009
    Randomized trial82 participantsHeart Health forMagnesium
  88. Positive effects of magnesium supplementation in metabolic syndrome.
    Kisters S; Kisters K; Werner T; Vormann J; Tokmak F; Westhoff T; Gröber U; Predel HG; Reuter H · International journal of clinical pharmacology and therapeutics · 2024
    Randomized trial54 participantsHeart Health forMagnesium
  89. Comparative Efficacy of Nutraceuticals on Endothelial Function: A Systematic Review and Network Meta-Analysis.
    Norouzzadeh M; Rashedi MH; Mahdavi-Mazdeh G; Kosari A; Shahinfar H · Current atherosclerosis reports · 2026
    Meta-analysisHeart Health forMagnesium Heart Health forVitamin D
  90. Vitamin D supplementation for cardiometabolic risk markers in pregnant women based on the gestational diabetes mellitus or obesity status : a randomized clinical trial.
    Yin WJ; Wang P; Ma SS; Tao RX; Hu HL; Jiang XM; Zhang Y; Tao FB; Zhu P · European journal of nutrition · 2024
    Randomized trial1,537 participantsHeart Health forVitamin D
  91. Paricalcitol and endothelial function in chronic kidney disease trial.
    Zoccali C; Curatola G; Panuccio V; Tripepi R; Pizzini P; Versace M; Bolignano D; Cutrupi S; Politi R; Tripepi G; Ghiadoni L; Thadhani R; Mallamaci F · Hypertension (Dallas, Tex. : 1979) · 2015
    Randomized trial88 participantsHeart Health forVitamin D
  92. Vitamin D Supplementation, Serum 25(OH)D Concentrations and Cardiovascular Disease Risk Factors: A Systematic Review and Meta-Analysis.
    Mirhosseini N; Rainsbury J; Kimball SM · Frontiers in cardiovascular medicine · 2020
    Meta-analysis81 studies pooledHeart Health forVitamin D
  93. Does vitamin D supplementation modulate metabolic risk factors of cardiovascular disease? A systematic review and meta-analysis of clinical trials.
    Abumweis S; Alqadi S; Al Tarteer A; Alrefai W; Alzoughool F; Jew S; Qudah T · Asia Pacific journal of clinical nutrition · 2026
    Meta-analysis45 studies pooledHeart Health forVitamin D
  94. The effect of vitamin K1 on arterial calcification activity in subjects with diabetes mellitus: a post hoc analysis of a double-blind, randomized, placebo-controlled trial.
    Bellinge JW; Francis RJ; Lee SC; Bondonno NP; Sim M; Lewis JR; Watts GF; Schultz CJ · The American journal of clinical nutrition · 2022
    Randomized trial149 participantsHeart Health forVitamin K
  95. Predictive Model of Nail Consistency Using Scanning Electron Microscopy with Energy-Dispersive X-Ray.
    Mingorance Álvarez E; Martínez Quintana R; Pérez Pico AM; Mayordomo R · Biology · 2021
    Cross-sectional study57 participantsNail Health forCalcium
  96. Oral supplementation with specific bioactive collagen peptides improves nail growth and reduces symptoms of brittle nails.
    Hexsel D; Zague V; Schunck M; Siega C; Camozzato FO; Oesser S · Journal of cosmetic dermatology · 2018
    Single-arm trial25 participantsNail Health forCollagen
  97. Influence of collagen peptide supplementation on visible signs of skin and nail health and -aging in an East Asian population: A double blind, randomized, placebo-controlled trial.
    Vleminckx S; Virgilio N; Asserin J; Prawitt J; Silva CIF · Journal of cosmetic dermatology · 2024
    Randomized trial85 participantsNail Health forCollagen
  98. Nail Supplements: When, How, and Why?
    Zaraa I; Richert B · Skin appendage disorders · 2026
    Narrative reviewNail Health forCollagen
  99. Expanding the COL7A1 mutation database: novel and recurrent mutations and unusual genotype-phenotype constellations in 41 patients with dystrophic epidermolysis bullosa.
    Kern JS; Kohlhase J; Bruckner-Tuderman L; Has C · The Journal of investigative dermatology · 2006
    Observational study41 participantsNail Health forCollagen
  100. Exploring the Impact of Hydrolyzed Collagen Oral Supplementation on Skin Rejuvenation: A Systematic Review and Meta-Analysis.
    Dewi DAR; Arimuko A; Norawati L; Yenny SW; Setiasih NL; Perdiyana A; Arkania N; Nadhira F; Wiliantari N · Cureus · 2024
    Meta-analysis967 participants14 studies pooledSkin Health forCollagen
  101. Oral Intake of Low-Molecular-Weight Collagen Peptide Improves Hydration, Elasticity, and Wrinkling in Human Skin: A Randomized, Double-Blind, Placebo-Controlled Study.
    Kim DU; Chung HC; Choi J; Sakai Y; Lee BY · Nutrients · 2018
    Randomized trial64 participantsSkin Health forCollagen