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D3 1000 IU

Nature Made
4.9
★ ★ ★ ★ ★
(601 ratings)
Vitamin D 1000 IU
Product Image
Score87
Best suited to general health, with the clearest benefits coming from the disclosed active ingredients. The large supply offers strong value, though source and complete excipient details are not provided.
How scoring works
Quantity:650 Softgel(s) • (650 servings)
Goals:
General Health
Immunity
Anti-Aging
Anti-Inflammatory Support
Testosterone Support
Energy
Fitness

Score 87

Best suited to general health, with the clearest benefits coming from the disclosed active ingredients. The large supply offers strong value, though source and complete excipient details are not provided.
How scoring works

Also available as

1 option
2000.00IU • 260 servings D 2000 IU • 260 Softgel(s) • 260 servings $13.97 ($0.05 per serving)
$24.99($0.03 per serving)
Walmart
$ 24.99
Report prices

Analysis

A focused D3 softgel provides a moderate maintenance amount in an absorption-friendly format. The large supply offers strong value, though source and complete excipient details are not provided.

Vitamin D3 provides foundational support for calcium regulation, bone health, muscle function, and immune activity. The clearly disclosed maintenance amount and softgel delivery make it a practical focused option. Raw-source and independent verification details are not shown.

The 1,000 IU D3 softgel offers routine vitamin D maintenance that may support normal muscle and bone function. Its fat-compatible delivery is suitable for this vitamin. The amount is modest for correcting a marked deficiency and does not act as a direct sports-performance dose.

Who is it for
  • People seeking general health support
  • People seeking immunity support
  • People seeking anti-aging support
Best for
  • General Health
  • Immunity
  • Anti-Aging

Pros

  • A focused D3 softgel provides a moderate maintenance amount in an absorption-friendly format.
  • Vitamin D3 provides foundational support for calcium regulation, bone health, muscle function, and immune activity.
  • The clearly disclosed maintenance amount and softgel delivery make it a practical focused option.
  • The single-nutrient design remains easy to understand and contains no obvious active padding.
  • Vitamin D3 supports bone integrity, muscle function, and immune regulation, which are foundational to healthy aging.

Cons

  • The large supply offers strong value, though source and complete excipient details are not provided.
  • Raw-source and independent verification details are not shown.
  • Vitamin D3 provides modest immune-modulating support with greatest relevance in low-status users.
  • The maintenance amount and single pathway limit its anti-inflammatory reach.
  • The serving sits below the stronger goal-specific range.

Nutrient quality

96 Highest impact

Cholecalciferol in a softgel is a well-absorbed form and suitable delivery format. The vitamin D3 amount is suitable for routine maintenance use.

.

Ingredient transparency

85 Highest impact

The single active ingredient has a specific amount. A complete oil carrier and inactive ingredient list was not supplied.

.

Customer satisfaction

70 High impact

The available aggregate rating is strong for this category. No firsthand outcome details were supplied, so alignment with the intended use is uncertain.

.

Value for money

97 Highest impact

The preferred D3 form and softgel delivery provide strong quality for the serving cost. The product is highly competitive among maintenance vitamin D softgels.

.
Report analysis

Goals

General Health
General Health
Impact
Highest effect
A Goal FitA- Strength of SupportD+ CoverageA+ Formula Quality
Vitamin D · 1000 IU

Vitamin D3 provides foundational support for calcium regulation, bone health, muscle function, and immune activity. The clearly disclosed maintenance amount and softgel delivery make it a practical focused option.

Raw-source and independent verification details are not shown. The single-nutrient design remains easy to understand and contains no obvious active padding.

Study evidence
Vitamin D Supportive 115 studies
Immunity
Immunity
Impact
Highest effect
A Goal FitA- Strength of SupportD+ CoverageA+ Formula Quality
Vitamin D · 1000 IU

Vitamin D3 provides foundational support for calcium regulation, bone health, muscle function, and immune activity. The clearly disclosed maintenance amount and softgel delivery make it a practical focused option.

Raw-source and independent verification details are not shown. The single-nutrient design remains easy to understand and contains no obvious active padding.

Study evidence
Vitamin D Supportive 85 studies
Anti-Aging
Anti-Aging
Impact
High effect
B- Goal FitB+ Strength of SupportC- CoverageA Formula Quality
Vitamin D · 1000 IU

Vitamin D3 supports bone integrity, muscle function, and immune regulation, which are foundational to healthy aging. Its value is greatest when correcting or preventing inadequate vitamin D status rather than acting as a broad longevity intervention.

The cholecalciferol form and exact amount are clearly disclosed in a focused formula. No meaningful product-specific warning is supported by the supplied dose and formula.

Study evidence
Vitamin D Supportive 50 studies
Anti-Inflammatory Support
Anti-Inflammatory Support
Impact
High effect
B- Goal FitB- Strength of SupportD- CoverageA+ Formula Quality
Vitamin D · 1000 IU

Vitamin D3 provides modest immune-modulating support with greatest relevance in low-status users. The maintenance amount and single pathway limit its anti-inflammatory reach.

It suits routine vitamin D intake more than targeted inflammation management. Vitamin D status is a better guide to need than inflammation symptoms alone.

Study evidence
Vitamin D Supportive 101 studies
Testosterone Support
Testosterone Support
Impact
High effect
C+ Goal FitB- Strength of SupportD- CoverageA+ Formula Quality
Vitamin D · 1000 IU

Vitamin D3 may support testosterone when vitamin D status is low, although human trials are mixed. The maintenance amount is clearly disclosed in a suitable softgel.

The serving sits below the stronger goal-specific range. It also provides no zinc, boron, magnesium, or stress-modulating support.

Study evidence
Vitamin D Supportive 56 studies
Energy
Energy
Impact
High effect
B- Goal FitB- Strength of SupportD- CoverageA+ Formula Quality
Vitamin D · 1000 IU

Vitamin D3 may support energy and muscle function when low status contributes to fatigue. The softgel supplies a clear routine maintenance amount in an absorption-friendly format.

The formula does not address immediate alertness, metabolic cofactors, or stress resilience. People with adequate vitamin D status should not expect a direct energy boost.

Study evidence
Vitamin D Supportive 32 studies
Fitness
Fitness
Impact
High effect
C- Goal FitB+ Strength of SupportD- CoverageA Formula Quality
Vitamin D · 1000 IU

The 1,000 IU D3 softgel offers routine vitamin D maintenance that may support normal muscle and bone function. Its fat-compatible delivery is suitable for this vitamin.

The amount is modest for correcting a marked deficiency and does not act as a direct sports-performance dose. No energy, endurance, hydration, or muscle-repair ingredients broaden the fitness contribution.

Study evidence
Vitamin D Disputed 163 studies

Ingredients

IngredientAmount per serving
Vitamin D3 (Cholecalciferol)
 1000 IU
Gluten Free Adults 18–50
Report overview
Vitamin D (Cholecalciferol) · 1000 IU OverallScore78
A Active Ingredient Quality & BioavailabilityC Dose, Safety & Label TransparencyB+ Value

The softgel supplies vitamin D3 at a routine maintenance amount with a delivery format suited to this fat-soluble vitamin. The raw source and independent quality verification are not disclosed. Its large supply provides good vitamin D efficiency for long-term maintenance use.

View ingredientView products
Loading alternative details
87 Performance

Vitamin D-3 1000 IU

NOW
<p>A focused formula supplies 1000 IU of lanolin-derived vitamin D3 without unrelated active ingredients. Compared with the original, the simple, clearly quantified vitamin D3 profile is easier to assess and closely matches the original’s listed vitamin D amount.</p>
85 Performance

D3 Supplement 1000 IU

Spring Valley
<p>A focused formula supplies 1000 IU of cholecalciferol without unrelated active ingredients. Compared with the original, the simple, clearly quantified vitamin D3 profile is easier to assess and closely matches the original’s listed vitamin D amount.</p>
85 Performance

D3 1000 IU

Nature Made
<p>A focused formula supplies 1000 IU of cholecalciferol without unrelated active ingredients. Compared with the original, the simple, clearly quantified vitamin D3 profile is easier to assess and closely matches the original’s listed vitamin D amount.</p>
88 Budget

Liquid Vitamin D3 Drops 1000 IU Natural Citrus Flavor

Bluebonnet
<p>A liquid formula supplies 1000 IU of lanolin-derived vitamin D3 without unrelated active ingredients. It costs less per serving than the original and closely matches the original’s listed vitamin D amount.</p>
88 Budget

Extra Strength Liquid Vitamin D3

Protocol For Life Balance
<p>A liquid formula supplies 2000 IU of lanolin-derived vitamin D3 without unrelated active ingredients. It costs less per serving than the original and uses a higher vitamin D amount, so suitability depends more heavily on measured status and professional guidance.</p>
82 Budget

D3 Supplement 400 IU

Spring Valley
<p>A focused formula supplies 400 IU of cholecalciferol, a modest amount that may fit low-dose needs but may be insufficient for many adults. It costs less per serving than the original and uses a lower vitamin D amount that may suit routine maintenance better, but may not match a documented high-dose need.</p>
88 Value

Liquid Vitamin D3 Drops 2000 IU Natural Citrus Flavor

Bluebonnet
<p>A liquid formula supplies 2000 IU of lanolin-derived vitamin D3 without unrelated active ingredients. The lower serving cost and focused ingredient list improve value, while the dose uses a higher vitamin D amount, so suitability depends more heavily on measured status and professional guidance.</p>
88 Value

D3 2000 IU

Nature Made
<p>A focused formula supplies 2000 IU of cholecalciferol without unrelated active ingredients. Its focused formula and dose alignment support practical value, although it does not undercut the original’s serving cost and uses a higher vitamin D amount, so suitability depends more heavily on measured status and professional guidance.</p>
86 Value

Vitamin D-3 2000 IU

Source Naturals Wellness
<p>A focused formula supplies 2000 IU of cholecalciferol without unrelated active ingredients. Its focused formula and dose alignment support practical value, although it does not undercut the original’s serving cost and uses a higher vitamin D amount, so suitability depends more heavily on measured status and professional guidance.</p>
Report alternatives

Sources

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

  1. Vitamin D supplementation and its influence on muscle strength and mobility in community-dwelling older persons: a systematic review and meta-analysis.
    Rosendahl-Riise H; Spielau U; Ranhoff AH; Gudbrandsen OA; Dierkes J · Journal of human nutrition and dietetics : the official journal of the British Dietetic Association · 2018
    Meta-analysis2,866 participants15 studies pooledFitness forVitamin D
  2. Vitamin D supplementation and hospitalization for infection in older adults: A post-hoc analysis of data from the Australian D-Health Trial.
    Pham H; Waterhouse M; Baxter C; Romero BD; McLeod DS; Armstrong BK; Ebeling PR; English DR; Hartel G; O'Connell RL; van der Pols JC; Venn AJ; Webb PM; Whiteman DC; Neale RE · The American journal of clinical nutrition · 2023
    Randomized trial21,315 participantsImmunity forVitamin D
  3. No Causal Association between 25-Hydroxyvitamin D and Features of Skin Aging: Evidence from a Bidirectional Mendelian Randomization Study.
    Noordam R; Hamer MA; Pardo LM; van der Nat T; Kiefte-de Jong JC; Kayser M; Slagboom PE; Uitterlinden A; Zillikens MC; Beekman M; Nijsten T; van Heemst D; Gunn DA · The Journal of investigative dermatology · 2017
    Meta-analysis4,492 participants2 studies pooledAnti-Aging forVitamin D
  4. Effect of Vitamin D Supplementation on Body Composition and Physical Fitness in Healthy Adults: A Double-Blind, Randomized Controlled Trial.
    Sun X; Tanisawa K; Zhang Y; Ito T; Oshima S; Higuchi M; Cao ZB · Annals of nutrition & metabolism · 2020
    Randomized trial95 participantsFitness forVitamin D
  5. Effect of vitamin D status and vitamin D supplementation on immune function and prevention of acute respiratory tract infections in dark-skinned individuals: a systematic review and meta-analysis.
    Bournot AR; Darling AL; Givens ID; Lovegrove JA; Lanham-New SA; Hart KH · Public health nutrition · 2024
    Meta-analysis36,707 participants18 studies pooledImmunity forVitamin D
  6. Intrinsic capacity differs from functional ability in predicting 10-year mortality and biological features in healthy aging: results from the I-Lan longitudinal aging study.
    Lee WJ; Peng LN; Lin MH; Loh CH; Hsiao FY; Chen LK · Aging · 2023
    Cohort study1,839 participantsAnti-Aging forVitamin D
  7. Monthly High-Dose Vitamin D Treatment for the Prevention of Functional Decline: A Randomized Clinical Trial.
    Bischoff-Ferrari HA; Dawson-Hughes B; Orav EJ; Staehelin HB; Meyer OW; Theiler R; Dick W; Willett WC; Egli A · JAMA internal medicine · 2016
    Randomized trial200 participantsFitness forVitamin D
  8. Effects of Resistance Training Combined with Vitamin D Supplementation on Health-Related Variables in the Elderly: Muscle Strength, Body Composition, and Inflammatory Status.
    Rosa LCRD; Farinatti PTV; Batista MIF; Machado HRSN; Jesus VHS; Dantas WDN; Dutra PML; Silva NSLD · International journal of environmental research and public health · 2025
    Randomized trial26 participantsAnti-Aging forVitamin D
  9. Association Between Vitamin D and Influenza: Meta-Analysis and Systematic Review of Randomized Controlled Trials.
    Zhu Z; Zhu X; Gu L; Zhan Y; Chen L; Li X · Frontiers in nutrition · 2022
    Meta-analysis4,859 participants10 studies pooledImmunity forVitamin D
  10. Effects of vitamin D3 supplementation on strength of lower and upper extremities in athletes: an updated systematic review and meta-analysis of randomized controlled trials.
    Han Q; Xiang M; An N; Tan Q; Shao J; Wang Q · Frontiers in nutrition · 2024
    Meta-analysis354 participants10 studies pooledFitness forVitamin D
  11. Effect of moderate or high versus low dose daily vitamin D on COVID-19 incidence: A double-blind, parallel-group randomized clinical trial.
    Meltzer DO; Moy JN; Schram AW; Tate A; Hyman MJ; Cursio JF; Vokes T; Yeo KJ; Prochaska M; Jacobs JJ; Solway J · Clinical nutrition (Edinburgh, Scotland) · 2026
    Randomized trial955 participantsImmunity forVitamin D
  12. 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
  13. Effect of Calcifediol on Physical Performance and Muscle Strength Parameters: A Systematic Review and Meta-Analysis.
    Barbagallo M; Veronese N; Di Prazza A; Pollicino F; Carruba L; La Carrubba A; Dominguez LJ · Nutrients · 2022
    Meta-analysis5,446 participants7 studies pooledFitness forVitamin D
  14. Impact of Vitamin D Supplementation on Influenza Vaccine Response and Immune Functions in Deficient Elderly Persons: A Randomized Placebo-Controlled Trial.
    Goncalves-Mendes N; Talvas J; Dualé C; Guttmann A; Corbin V; Marceau G; Sapin V; Brachet P; Evrard B; Laurichesse H; Vasson MP · Frontiers in immunology · 2019
    Randomized trial38 participantsImmunity forVitamin D
  15. 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
  16. Effects of active vitamin D analogues on muscle strength and falls in elderly people: an updated meta-analysis.
    Xiong A; Li H; Lin M; Xu F; Xia X; Dai D; Sun R; Ling Y; Qiu L; Wang R; Ding Y; Xie Z · Frontiers in endocrinology · 2024
    Meta-analysis2,431 participants10 studies pooledFitness forVitamin D
  17. High-dose oral vitamin D supplementation for prevention of infections in children aged 0 to 59 months: a systematic review and meta-analysis.
    Carboo JA; Dolman-Macleod RC; Malan L; Lombard MJ · Nutrition reviews · 2024
    Meta-analysis5,748 participants7 studies pooledImmunity forVitamin D
  18. Association Between Vitamin D, Frailty, and Progression of Frailty in Community-Dwelling Older Women.
    Buchebner D; Bartosch P; Malmgren L; McGuigan FE; Gerdhem P; Akesson KE · The Journal of clinical endocrinology and metabolism · 2020
    Cohort study1,044 participantsAnti-Aging forVitamin D
  19. Vitamin D and Muscle Health: A Systematic Review and Meta-analysis of Randomized Placebo-Controlled Trials.
    Bislev LS; Grove-Laugesen D; Rejnmark L · Journal of bone and mineral research : the official journal of the American Society for Bone and Mineral Research · 2021
    Meta-analysis8,747 participants54 studies pooledFitness forVitamin D
  20. Effect of vitamin D3 supplementation on cellular immunity and inflammatory markers in COVID-19 patients admitted to the ICU.
    Bychinin MV; Klypa TV; Mandel IA; Yusubalieva GM; Baklaushev VP; Kolyshkina NA; Troitsky AV · Scientific reports · 2022
    Randomized trial110 participantsImmunity forVitamin D
  21. A Systematic Review and Meta-Analysis of The Effect of Low Vitamin D on Cognition.
    Goodwill AM; Szoeke C · Journal of the American Geriatrics Society · 2017
    Meta-analysis29 studies pooledAnti-Aging forVitamin D
  22. Effects of Vitamin D3 Supplementation and Resistance Training on 25-Hydroxyvitamin D Status and Functional Performance of Older Adults: A Randomized Placebo-Controlled Trial.
    Aschauer R; Unterberger S; Zöhrer PA; Draxler A; Franzke B; Strasser EM; Wagner KH; Wessner B · Nutrients · 2022
    Randomized trial100 participantsFitness forVitamin D
  23. Current opinion on the role of vitamin D supplementation in respiratory infections and asthma/COPD exacerbations: A need to establish publication guidelines for overcoming the unpublished data.
    Anitua E; Tierno R; Alkhraisat MH · Clinical nutrition (Edinburgh, Scotland) · 2022
    Meta-analysis50,554 participants65 studies pooledImmunity forVitamin D
  24. Individual and additive effects of vitamin D, omega-3 and exercise on DNA methylation clocks of biological aging in older adults from the DO-HEALTH trial.
    Bischoff-Ferrari HA; Gängler S; Wieczorek M; Belsky DW; Ryan J; Kressig RW; Stähelin HB; Theiler R; Dawson-Hughes B; Rizzoli R; Vellas B; Rouch L; Guyonnet S; Egli A; Orav EJ; Willett W; Horvath S · Nature aging · 2025
    Randomized trial777 participantsAnti-Aging forVitamin D
  25. Effects of vitamin D supplementation on maximal strength and power in athletes: a systematic review and meta-analysis of randomized controlled trials.
    Sist M; Zou L; Galloway SDR; Rodriguez-Sanchez N · Frontiers in nutrition · 2023
    Meta-analysis436 participants11 studies pooledFitness forVitamin D
  26. Cholecalciferol decreases inflammation and improves vitamin D regulatory enzymes in lymphocytes in the uremic environment: A randomized controlled pilot trial.
    Carvalho JTG; Schneider M; Cuppari L; Grabulosa CC; T Aoike D; Q Redublo BM; C Batista M; Cendoroglo M; Maria Moyses R; Dalboni MA · PloS one · 2017
    Randomized trial44 participantsImmunity forVitamin D
  27. 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
  28. Skeletal muscle strength in young Asian Indian females after vitamin D and calcium supplementation: a double-blind randomized controlled clinical trial.
    Goswami R; Vatsa M; Sreenivas V; Singh U; Gupta N; Lakshmy R; Aggarwal S; Ganapathy A; Joshi P; Bhatia H · The Journal of clinical endocrinology and metabolism · 2013
    Randomized trial173 participantsFitness forVitamin D
  29. Effect of weekly vitamin D supplementation on the severity of atopic dermatitis and type 2 immunity biomarkers in children: A randomized controlled trial.
    Borzutzky A; Iturriaga C; Pérez-Mateluna G; Cristi F; Cifuentes L; Silva-Valenzuela S; Vera-Kellet C; Cabalín C; Hoyos-Bachiloglu R; Navarrete-Dechent C; Cossio ML; Le Roy C; Camargo CA · Journal of the European Academy of Dermatology and Venereology : JEADV · 2024
    Randomized trial101 participantsImmunity forVitamin D
  30. 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
  31. 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
  32. Vitamin D deficiency and C-reactive protein: a bidirectional Mendelian randomization study.
    Zhou A; Hyppönen E · International journal of epidemiology · 2023
    Observational study294,970 participantsAnti-Inflammatory Support forVitamin D
  33. Vitamin D in Children With Inflammatory Bowel Disease: A Randomized Controlled Clinical Trial.
    El Amrousy D; El Ashry H; Hodeib H; Hassan S · Journal of clinical gastroenterology · 2021
    Randomized trial120 participantsAnti-Inflammatory Support forVitamin D
  34. Vitamin D supplementation reduces infection rate and promotes wound healing in patients with diabetic foot ulcers.
    Gao YQ; Gao YH; Xing JH · World journal of diabetes · 2025
    Randomized trial120 participantsAnti-Inflammatory Support forVitamin D
  35. Associations of C-reactive Protein with 25-hydroxyvitamin D in 24 Specific Diseases: A Cross-sectional Study from NHANES.
    Yang F; Sun M; Sun C; Li J; Yang X; Bi C; Wang M; Pu L; Wang J; Wang C; Xie M; Yao Y; Jin L · Scientific reports · 2020
    Cross-sectional study9,809 participantsAnti-Inflammatory Support forVitamin D
  36. Combined effects of vitamin D deficiency and systemic inflammation on all-cause mortality and cause-specific mortality in older adults.
    Zhang C; Cui J; Li S; Shen J; Luo X; Yao Y; Shi H · BMC geriatrics · 2024
    Cohort study3,072 participantsAnti-Inflammatory Support forVitamin D
  37. Effect of Vitamin D Supplementation on Fatigue in Multiple Sclerosis: A Systematic Review and Meta-Analysis.
    López-Muñoz P; Torres-Costoso AI; Fernández-Rodríguez R; Guzmán-Pavón MJ; de Arenas-Arroyo SN; Basco-López JÁ; Reina-Gutiérrez S · Nutrients · 2023
    Meta-analysis345 participants5 studies pooledEnergy forVitamin D
  38. Vitamin D Supplementation in Adolescents and Young Adults With Juvenile Systemic Lupus Erythematosus for Improvement in Disease Activity and Fatigue Scores: A Randomized, Double-Blind, Placebo-Controlled Trial.
    Lima GL; Paupitz J; Aikawa NE; Takayama L; Bonfa E; Pereira RM · Arthritis care & research · 2016
    Randomized trial40 participantsEnergy forVitamin D
  39. Vitamin D in Myalgic Encephalomyelitis/Chronic Fatigue Syndrome After COVID-19 or Vaccination: A Randomized Controlled Trial.
    Kodama S; Nakata M; Konishi N; Yoshino M; Fujisawa A; Naganuma M; Kobayashi Y; Hirai Y; Kitagawa A; Miyokawa M; Mishima R; Teramukai S; Fukushima M · Nutrients · 2026
    Randomized trial91 participantsEnergy forVitamin D
  40. The effects of vitamin D supplementation on disease activity and fatigue in Libyan rheumatoid arthritis patients.
    Elfituri S · Reumatologia · 2024
    Randomized trial68 participantsEnergy forVitamin D
  41. The effect of home-based aerobic training and vitamin D supplementation on fatigue and quality of life in patients with multiple sclerosis during COVID-19 outbreak.
    Bahmani E; Hoseini R; Amiri E · Science & sports · 2022
    Randomized trial40 participantsEnergy forVitamin D
  42. Effects of vitamin D supplementation on upper and lower body muscle strength levels in healthy individuals. A systematic review with meta-analysis.
    Tomlinson PB; Joseph C; Angioi M · Journal of science and medicine in sport · 2016
    Meta-analysis310 participants7 studies pooledFitness forVitamin D
  43. Influence of Sunlight and Oral D3 Supplementation on Serum 25(OH)D Concentration and Exercise Performance in Elite Soccer Players.
    Michalczyk MM; Gołaś A; Maszczyk A; Kaczka P; Zając A · Nutrients · 2021
    Randomized trial33 participantsFitness forVitamin D
  44. Effects of Vitamin D Supplementation in Elite Athletes: A Systematic Review.
    Wyatt PB; Reiter CR; Satalich JR; O'Neill CN; Edge C; Cyrus JW; O'Connell RS; Vap AR · Orthopaedic journal of sports medicine · 2024
    Systematic review482 participants14 studies pooledFitness forVitamin D
  45. Association between serum vitamin D levels and cardiorespiratory fitness in the adult population of the USA.
    Marawan A; Kurbanova N; Qayyum R · European journal of preventive cardiology · 2020
    Cross-sectional study1,995 participantsFitness forVitamin D
  46. 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
  47. 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
  48. 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
  49. 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
  50. 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
  51. Vitamin D supplementation to prevent acute respiratory infections: individual participant data meta-analysis.
    Martineau AR; Jolliffe DA; Greenberg L; Aloia JF; Bergman P; Dubnov-Raz G; Esposito S; Ganmaa D; Ginde AA; Goodall EC; Grant CC; Janssens W; Jensen ME; Kerley CP; Laaksi I; Manaseki-Holland S; Mauger D; Murdoch DR; Neale R; Rees JR; Simpson S; Stelmach I; Trilok Kumar G; Urashima M; Camargo CA; Griffiths CJ; Hooper RL · Health technology assessment (Winchester, England) · 2020
    Meta-analysis11,321 participants25 studies pooledImmunity forVitamin D
  52. Vitamin D3 and deconvoluting a rash.
    Ernst MK; Evans ST; Techner JM; Rothbaum RM; Christensen LF; Onay UV; Biyashev D; Demczuk MM; Nguyen CV; Honda KS; McCormick TS; Tsoi LC; Gudjonsson JE; Cooper KD; Lu KQ · JCI insight · 2023
    Randomized trial28 participantsImmunity forVitamin D
  53. Effect of Two Different Doses of Vitamin D Supplementation on Metabolic Profiles of Insulin-Resistant Patients with Polycystic Ovary Syndrome.
    Jamilian M; Foroozanfard F; Rahmani E; Talebi M; Bahmani F; Asemi Z · Nutrients · 2018
    Randomized trial90 participantsTestosterone Support forVitamin D
  54. Androgens and hirsutism score of overweight women with polycystic ovary syndrome improved after vitamin D treatment: A randomized placebo controlled clinical trial.
    Al-Bayyari N; Al-Domi H; Zayed F; Hailat R; Eaton A · Clinical nutrition (Edinburgh, Scotland) · 2021
    Randomized trial60 participantsTestosterone Support forVitamin D
  55. Association between plasma 25-OH vitamin D and testosterone levels in men.
    Nimptsch K; Platz EA; Willett WC; Giovannucci E · Clinical endocrinology · 2012
    Case-control study1,362 participantsTestosterone Support forVitamin D
  56. Causal Link Between Vitamin D and Total Testosterone in Men: A Mendelian Randomization Analysis.
    Chen C; Zhai H; Cheng J; Weng P; Chen Y; Li Q; Wang C; Xia F; Wang N; Lu Y · The Journal of clinical endocrinology and metabolism · 2020
    Other4,254 participantsTestosterone Support forVitamin D
  57. Associations of vitamin D status and vitamin D-related polymorphisms with sex hormones in older men.
    Rafiq R; van Schoor NM; Sohl E; Zillikens MC; Oosterwerff MM; Schaap L; Lips P; de Jongh RT · The Journal of steroid biochemistry and molecular biology · 2017
    Cohort study643 participantsTestosterone Support forVitamin D