Magnesium & Calcium

Magnesium & Calcium

NOW4.8 (33,827 ratings)
Format:Tablet Quantity: 250 Tablet(s) · 83 servings
Goals

About this product

Filling mineral gaps for bone and muscle function is the clearest use. Calcium contributes 400 mg, vitamin D3 supports calcium use, and 15 mg zinc adds normal nutritional support. The combination does not establish broader energy, testosterone or cardiovascular improvements when intake is already adequate.

The declared 800 mg elemental magnesium serving is unusually large and deserves more attention than the number of magnesium forms. Glycinate and taurinate are included alongside oxide and other sources, but their proportions are undisclosed. The larger amount does not show greater benefit for stress, mood or everyday energy.

The cost is attractive for a combined mineral supplement, and the named zinc source helps clarify ingredient quality. Unclear calcium and magnesium proportions make it harder to know how much the more favorable forms contribute. People wanting a modest magnesium top-up may find the serving less suitable than its low cost first suggests.

Who is it for
  • Adults with a clear calcium intake gap who also need the accompanying nutrients
  • People reviewing whether a large magnesium amount fits their needs
Best for
  • Combined calcium and vitamin D nutritional support
  • Filling identified mineral gaps rather than seeking a general performance boost

Pros

  • Calcium provides a meaningful partial contribution toward daily intake
  • Includes vitamin D3 alongside calcium
  • Uses a clearly named zinc monomethionine source
  • Attractive cost for combined mineral coverage

Cons

  • Magnesium and calcium sources are not individually quantified
  • Oxide is included alongside more favorable magnesium forms
  • The large magnesium amount makes small intake adjustments difficult
  • Routine mood, focus and metabolic gains remain uncertain

Warnings

  • The 800 mg elemental magnesium serving is large, and magnesium can draw water into the bowel; loose stools may make the full serving difficult to tolerate.
  • Adding another magnesium supplement would further increase an already substantial daily amount.

Product analysis

64 out of 100

Magnesium & Calcium supplies minerals for normal bone maintenance and may help fill dietary gaps. Unstated proportions within the calcium and magnesium mixtures make the quality of the blend harder to judge.

AI assessment of the formula, label and price. How scoring works

Nutrient Quality45

The zinc form is favorable, while the calcium and magnesium mixtures are harder to judge because their proportions are missing. Vitamin D has a named form, but its relative quality remains uncertain.

Ingredient Transparency80

Amounts and forms are disclosed for all four nutrients. Missing proportions in the calcium and magnesium mixtures prevent a precise comparison of their makeup.

Value For Money54

Calcium offers good value and zinc is reasonably priced for the serving. Magnesium offers weaker value because its form proportions are unclear, while vitamin D’s value remains uncertain.

Customer Satisfaction94

Customer feedback is very positive. Tens of thousands of ratings provide a broad view of satisfaction, without establishing health benefits.

Product Focus63

Bone maintenance and filling nutrient gaps are the clearest uses among the many intended benefits. The large magnesium serving does not establish greater benefit or suitability for an individual.

Format
Tablet
Container
250 Tablet(s)
Per serving
$0.26
Customer rating
4.8 · 33,827 ratings
Report analysis

Goals

Bone Health
Impact
Highest effect
B Ingredient FitA+ PathwaysA+ EvidenceA+ Formulation Logic
Magnesium · 800 mgCalcium · 400 mgVitamin D · 25 mcgZinc · 15 mg

Calcium and magnesium supply minerals for normal bone metabolism, and vitamin D supports calcium regulation when intake is insufficient. The 400 mg of calcium per serving can fill part of an intake gap. The 800 mg of magnesium exceeds the supplied comparison range without establishing extra benefit or suitability. Zinc receives a saved contribution, but its enzyme role does not establish independent adult fracture or bone-density benefit.

How this product is rated for Bone Health

Ingredient fit79

The declared elemental minerals have a clear nutritional connection to bone health.
Goal fit
The counted ingredients relate to bone health, although the product also links to other goals.
Dose adequacy
Calcium contributes partially, while magnesium exceeds the supplied range without establishing extra benefit; vitamin D and zinc contribute at their declared amounts.

Pathways100

Bone mineral supply is the strongest saved area. Mineral supply, calcium regulation and collagen-matrix findings meet the saved coverage threshold.
Depth
Bone mineral supply provides the strongest saved coverage.
Breadth
Mineral supply, calcium regulation and collagen-matrix findings meet the saved coverage threshold.

Evidence100

Calcium supplies the strongest saved evidence contribution. Nutritional support does not establish reliable fracture prevention.
Evidence strength
Calcium supplies the strongest saved evidence contribution, primarily supporting nutritional adequacy.
Studied preparation
The counted preparation checks were met, without establishing extra bone benefit from particular salt forms.

Formulation logic100

The counted ingredients have no unmet required partner in the saved findings. No assessed ingredient conflict was found.
Partner coverage
The counted ingredients have no unmet required partner in the saved findings.
Conflicts
No assessed ingredient conflict was identified.
Effective doses
All counted ingredients meet the saved minimum amount threshold, which does not establish fracture protection.
Study evidence
Calcium Supportive 144 studies
Magnesium Supportive 48 studies
Vitamin D Supportive 202 studies
Zinc Supportive 33 studies
Everyday Health
Impact
Highest effect
B Ingredient FitA+ PathwaysA- EvidenceA+ Formulation Logic
Vitamin D · 25 mcgMagnesium · 800 mgZinc · 15 mg

Calcium helps fill a dietary gap relevant to bone maintenance, while magnesium, vitamin D and zinc provide additional nutritional coverage when intake is low. The saved contributions span energy-related processes, mineral metabolism and antioxidant and immune defence. Amount coverage is uneven; the large magnesium declaration does not establish extra benefit or a safety judgment. The mixed mineral forms do not demonstrate superior effects or an added combination benefit.

How this product is rated for Everyday Health

Ingredient fit76

All four nutrients contribute, with partial overall amount coverage.
Goal fit
The counted nutrients give the formula a focused nutritional purpose, alongside links to other goals.
Dose adequacy
The saved amount comparison gives partial overall coverage, reflecting different contributions from magnesium, calcium, D and zinc.

Pathways100

The counted nutrients cover three categories, led by magnesium's energy-related contribution.
Depth
Energy-related nutrient processes reach full coverage.
Breadth
Energy-related processes, mineral metabolism, and antioxidant and immune defence meet the coverage threshold.

Evidence86

Magnesium supplies the leading evidence contribution for conditional nutritional support.
Evidence strength
Magnesium leads the evidence finding without establishing extra benefit above adequate nutrition.
Studied preparation
All counted nutrient declarations receive full preparation recognition; mixed forms receive no automatic advantage.

Formulation logic100

Partner checks are satisfied and no configured conflict was found.
Partner coverage
No counted nutrient lacks a required partner; this does not establish combination synergy.
Conflicts
No configured ingredient conflict was matched.
Effective doses
All four counted nutrients pass the minimum amount threshold.
Study evidence
Magnesium Supportive 114 studies
Vitamin D Supportive 115 studies
Zinc Supportive 60 studies
Immunity
Impact
High effect
C+ Ingredient FitD+ PathwaysA+ EvidenceA+ Formulation Logic
Magnesium · 800 mgZinc · 15 mgVitamin D · 25 mcg

Zinc and vitamin D support normal immune-cell function, with partial amount allowances in the saved findings. Magnesium also received an allowance, but the supplied context does not establish a routine immunity benefit from its immune-cell or inflammatory-marker observations. The declared 800 mg magnesium per serving exceeds the comparison range and does not establish added benefit or suitability.

How this product is rated for Immunity

Ingredient fit69

Zinc, Vitamin D, Magnesium receive the saved ingredient and amount allowances. Amounts and broader product purposes limit how specifically the formula addresses immunity.
Goal fit
Zinc, Vitamin D, Magnesium provide the relevant ingredient focus; the product’s wider purposes also affect the saved finding.
Dose adequacy
The relevant declared amounts receive partial allowances; lower amounts limit the saved contribution without proving the ingredients ineffective.

Pathways50

The strongest saved contribution concerns lymphocyte function and immune regulation. The saved findings identify meaningful coverage of lymphocyte function and immune regulation; other aspects receive less support.
Depth
The strongest saved contribution concerns lymphocyte function and immune regulation.
Breadth
The saved findings identify meaningful coverage of lymphocyte function and immune regulation; other aspects receive less support.

Evidence100

Zinc anchors the saved evidence finding; magnesium’s allowance does not establish a routine immunity outcome.
Evidence strength
Zinc anchors the saved evidence finding; magnesium’s allowance does not establish a routine immunity outcome.
Studied preparation
The saved findings accept the relevant preparations for comparison; they do not establish superiority over other nutrient forms.

Formulation logic100

No configured ingredient conflict was identified; this does not establish individual suitability.
Partner coverage
The credited ingredients have no missing required partner in the saved findings.
Conflicts
No configured ingredient conflict was identified; this does not establish individual suitability.
Effective doses
The ingredients counted here meet the saved minimum amount criterion, which is a comparison threshold rather than proof of clinical effectiveness.
Study evidence
Magnesium Supportive 8 studies
Vitamin D Supportive 85 studies
Zinc Supportive 73 studies
Testosterone Support
Impact
High effect
C+ Ingredient FitB- PathwaysA EvidenceA+ Formulation Logic
Magnesium · 800 mgZinc · 15 mgVitamin D · 25 mcg

Zinc helps maintain testosterone when zinc deficiency has lowered it; extra zinc has not shown an increase in zinc-replete men. Magnesium contributes to nutrient adequacy, but the supplied exercise-related study does not establish routine testosterone enhancement or a general effective amount.

How this product is rated for Testosterone Support

Ingredient fit69

Magnesium, Vitamin D and Zinc are the main ingredients counted toward testosterone-related support, within a formula that also targets other needs.
Goal fit
Magnesium, Vitamin D and Zinc are the main ingredients counted toward testosterone-related support, within a formula that also targets other needs.
Dose adequacy
The declared serving amounts receive partial consideration; this compares amounts with supplied reference ranges, without proving a testosterone-related effect.

Pathways70

The strongest saved connection is to free-testosterone availability, based on the counted ingredients; this does not itself demonstrate a testosterone increase. One testosterone-related-related area reaches the saved coverage threshold, leaving the other areas less represented.
Depth
The strongest saved connection is to free-testosterone availability, based on the counted ingredients; this does not itself demonstrate a testosterone increase.
Breadth
One testosterone-related-related area reaches the saved coverage threshold, leaving the other areas less represented.

Evidence93

Zinc provides the strongest saved evidence contribution here; its population and outcome limitations still apply.
Evidence strength
Zinc provides the strongest saved evidence contribution here; its population and outcome limitations still apply.
Studied preparation
The counted ingredients meet the saved preparation criteria; this does not make all labelled forms interchangeable with every clinical trial.

Formulation logic100

No listed ingredient conflict was matched in the supplied findings; this does not establish medication compatibility.
Partner coverage
The counted ingredients require no missing partner under the supplied findings; this does not imply an added benefit from combining them.
Conflicts
No listed ingredient conflict was matched in the supplied findings; this does not establish medication compatibility.
Effective doses
All counted ingredients meet the saved minimum amount criterion; this does not establish proven testosterone-raising doses.
Study evidence
Magnesium Disputed 5 studies
Vitamin D Supportive 56 studies
Zinc Disputed 7 studies
Energy
Impact
Moderate effect
C Ingredient FitF PathwaysA+ EvidenceA+ Formulation Logic
Vitamin D · 25 mcgMagnesium · 800 mg

Magnesium supports normal energy metabolism, and vitamin D can be relevant to fatigue in people with low vitamin D status. The recorded 800 mg magnesium amount does not imply a larger energy benefit, and different magnesium sources do not automatically inherit finished-product fatigue results.

How this product is rated for Energy

Ingredient fit65

The saved assessment identifies 2 relevant ingredients alongside 2 other actives. Its links to 15 goals reflect a broad purpose. The saved assessment finds partial alignment with its amount benchmarks. Unknown individual amounts provide no dose support.
Goal fit
The saved assessment identifies 2 relevant ingredients alongside 2 other actives. Its links to 15 goals reflect a broad purpose.
Dose adequacy
The saved assessment finds partial alignment with its amount benchmarks. Unknown individual amounts provide no dose support.

Pathways0

No coverage was recorded in the five assessed energy mechanisms. Nutritional support is distinct from those mechanisms. None of the three target areas reaches the saved coverage threshold.
Depth
No coverage was recorded in the five assessed energy mechanisms. Nutritional support is distinct from those mechanisms.
Breadth
None of the three target areas reaches the saved coverage threshold.

Evidence95

Vitamin D supplies the strongest saved evidence contribution at an amount counted by the assessment. That finding retains the population and preparation limits of the supplied evidence. The counted preparations match the saved research criteria.
Evidence strength
Vitamin D supplies the strongest saved evidence contribution at an amount counted by the assessment. That finding retains the population and preparation limits of the supplied evidence.
Studied preparation
The counted preparations match the saved research criteria.

Formulation logic100

The counted ingredients contribute independently or have their required partner present. 2 of 2 counted ingredients reach the saved minimum amount benchmark. No configured conflict was found.
Partner coverage
The counted ingredients contribute independently or have their required partner present.
Conflicts
No configured ingredient conflict was found in the saved assessment.
Effective doses
2 of 2 counted ingredients reach the saved minimum amount benchmark.
Study evidence
Magnesium Supportive 4 studies
Vitamin D Supportive 32 studies
Cardiovascular Support
Impact
High effect
C+ Ingredient FitD+ PathwaysB EvidenceA+ Formulation Logic
Magnesium · 800 mgVitamin D · 25 mcg

Magnesium supports normal blood-vessel function, but its effects on arterial stiffness and blood pressure are inconsistent across the supplied trials. One study found improved stiffness, while others found no overall vascular benefit. The declared salts do not establish superior cardiovascular effects. The 800 mg serving does not establish a greater effect, and vitamin D has not shown cardiovascular-event prevention in the supplied trial.

How this product is rated for Cardiovascular Support

Ingredient fit67

The relevant cardiovascular ingredients sit within a broader formula with other purposes. The declared amounts provide partial comparison with the saved benchmarks; unknown quantities reduce what can be established.
Goal fit
The relevant cardiovascular ingredients sit within a broader formula with other purposes.
Dose adequacy
The declared amounts provide partial comparison with the saved benchmarks; unknown quantities reduce what can be established.

Pathways54

Magnesium leads the findings through vascular tone and mineral balance; observed blood-pressure and stiffness effects depend on study context.
Depth
Magnesium leads the findings through vascular tone and mineral balance; observed blood-pressure and stiffness effects depend on study context.
Breadth
Only vascular tone and sodium balance reaches the saved coverage threshold.

Evidence79

Magnesium leads the evidence findings, but vascular trials are inconsistent and do not establish a routine cardiovascular effect.
Evidence strength
Magnesium leads the evidence findings, but vascular trials are inconsistent and do not establish a routine cardiovascular effect.
Studied preparation
The saved findings recognize the preparation, without establishing equivalence across trial populations, outcomes or serving schedules.

Formulation logic100

The included ingredients have no unmet partner requirement or matched conflict, and their amounts pass the saved minimum check.
Partner coverage
The included ingredients can contribute independently or have the required partner according to the supplied findings.
Conflicts
No configured ingredient conflict was matched in the supplied findings.
Effective doses
The included ingredients pass the saved minimum amount check; this does not establish a proven effective cardiovascular dose.
Study evidence
Magnesium Supportive 123 studies
Vitamin D Mixed 170 studies

Ingredients

IngredientAmount per servingScore
Vitamin D3 (Cholecalciferol)
25 mcg
Calcium (Aquamin TG seaweed derived Minerals, Calcium Citrate)
400 mg 70
Magnesium (Aquamin TG seaweed derived Minerals, Magnesium Citrate, Magnesium Glycinate, Magnesium Oxide, Magnesium Taurinate)
800 mg 44
Zinc (L-OptiZinc Monomethionine)
15 mg 76
Gluten Free Adults 18–50 Kosher Dairy Free
Report overview
D- Active Ingredient Quality & BioavailabilityB+ Dose, Safety & Label TransparencyA+ Value
A+ Active Ingredient Quality & BioavailabilityC Dose, Safety & Label TransparencyC Value
+1
Zinc is clearly listed at 15 mg per serving as L-monomethionine sulfate, a favorable form choice in the supplied comparison. Copper quantity is unknown, so the zinc-to-copper balance cannot be checked.
How this ingredient is rated

Active Ingredient Quality & Bioavailability100

L-monomethionine sulfate is a clearly identified source and a strength when comparing the zinc form.
Zinc Form Bioavailability
Zinc L-monomethionine sulfate receives a favorable absorption assessment in the supplied comparison.

Dose, Safety & Label Transparency61

The 15 mg elemental amount is clear, but copper quantity remains unknown. That leaves the zinc-to-copper balance unverified rather than showing that copper is absent.
Elemental Dose Transparency
The saved label facts clearly identify 15 mg elemental zinc per serving and its source form.
Zinc Dosage Safety & Effectiveness
The serving supplies 15 mg elemental zinc, favorably assessed for its amount without establishing individual suitability.
Zinc-to-Copper Mineral Balance
Copper quantity is unknown, so no zinc-to-copper ratio can be established; unknown does not mean zero copper.

Value60

About $0.26 per whole-product serving is a middle-priced option in the supplied comparison. The cost covers the entire supplement rather than zinc alone.
Price Per Serving Efficiency
The whole-product serving costs about $0.26, a middle-priced option when comparing serving prices independently of zinc quantity.
Report alternatives

Sources

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

  1. 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
  2. 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
  3. 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
  4. 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
  5. 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
  6. 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
  7. 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
  8. 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
  9. 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
  10. 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
  11. 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
  12. 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
  13. 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
  14. 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
  15. 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
  16. Increased incidence of fractures in middle-aged and elderly men with low intakes of phosphorus and zinc.
    Elmståhl S; Gullberg B; Janzon L; Johnell O; Elmståhl B · Osteoporosis international : a journal established as result of cooperation between the European Foundation for Osteoporosis and the National Osteoporosis Foundation of the USA · 1999
    Cohort study6,576 participantsBone Health forZinc
  17. Zinc Supplementation Increases Procollagen Type 1 Amino-Terminal Propeptide in Premenarcheal Girls: A Randomized Controlled Trial.
    Berger PK; Pollock NK; Laing EM; Chertin V; Bernard PJ; Grider A; Shapses SA; Ding KH; Isales CM; Lewis RD · The Journal of nutrition · 2016
    Randomized trial147 participantsBone Health forZinc
  18. Randomized controlled trial of prenatal zinc supplementation and fetal bone growth.
    Merialdi M; Caulfield LE; Zavaleta N; Figueroa A; Costigan KA; Dominici F; Dipietro JA · The American journal of clinical nutrition · 2004
    Randomized trial242 participantsBone Health forZinc
  19. The effects of zinc supplementation on serum zinc, alkaline phosphatase activity and fracture healing of bones.
    Sadighi A; Roshan MM; Moradi A; Ostadrahimi A · Saudi medical journal · 2009
    Randomized trial60 participantsBone Health forZinc
  20. Is Zinc an Important Trace Element on Bone-Related Diseases and Complications? A Meta-analysis and Systematic Review from Serum Level, Dietary Intake, and Supplementation Aspects.
    Ceylan MN; Akdas S; Yazihan N · Biological trace element research · 2021
    Meta-analysis40 studies pooledBone Health forZinc