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Vitamin D-3 1000 IU

Source Naturals
4.7
★ ★ ★ ★ ★
(3343 ratings)
Vitamin D 2000 IU
Product Image
Score82
A simple, economical D3 tablet delivers a useful listed amount. Confirm the physical label because the product name and ingredient amount do not match in the supplied data.
How scoring works
Quantity:200 Tablet(s) • (100 servings)
Goals:
General Health
Immunity
Anti-Inflammatory Support
Anti-Aging
Testosterone Support
Energy

Score 82

A simple, economical D3 tablet delivers a useful listed amount. Confirm the physical label because the product name and ingredient amount do not match in the supplied data.
How scoring works
$9.38($0.09 per serving)
Vitacost
$ 9.38
iHerb
$ 9.38
Amazon
$ 9.99
iHerb
$ 9.38
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Analysis

The listed active amount is 2,000 IU of vitamin D3, which fits a common adult maintenance range. A single-ingredient focus makes the purpose easy to understand and avoids low-value active additions.

The dry tablet has no identified fat carrier, so taking it with a meal containing fat may support absorption. The supplied data also show a mismatch between the 1,000 IU product name and the 2,000 IU ingredient amount, which should be resolved on the physical label before use.

A large bottle and simple formula make this a practical option for regular D3 users. It best fits adults whose target intake has already been established and who verify the actual strength before dosing.

Who is it for
  • Adults seeking a focused daily D3 tablet
  • Users whose intended intake is around 2,000 IU
  • People willing to take D3 with a meal containing fat
Best for
  • Routine adult vitamin D maintenance
  • Simple single-active supplementation
  • Long-supply value

Pros

  • Uses vitamin D3
  • Lists a meaningful 2,000 IU amount
  • Keeps the active formula focused
  • Provides strong serving value

Cons

  • The product name and listed ingredient amount conflict
  • No oil carrier is stated
  • The raw D3 source is not disclosed
  • Complete inactive ingredients are not supplied

Warnings

  • Verify the physical label strength before use because the supplied name and ingredient amount differ
  • Count fortified foods and other supplements when calculating total vitamin D intake
  • People with elevated calcium or increased vitamin D sensitivity need dose guidance before regular use

Nutrient quality

92 Highest impact

Cholecalciferol is a suitable form and the listed ingredient amount is meaningful. A focused single-active formula is balanced, but the name-to-label conflict weakens practical dose confidence.

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Ingredient transparency

70 High impact

No blend hides the active, but the product name conflicts with the supplied vitamin D amount. Missing directions and tablet excipients leave additional label gaps.

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Customer satisfaction

71 High impact

The aggregate satisfaction signal is strong and supported by extensive volume. Missing review details prevent assessment of recurring complaints or ease of use.

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Value for money

98 Highest impact

A meaningful amount and large supply create excellent serving value. The dose conflict should be resolved before use despite otherwise strong competitiveness.

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Report analysis

Goals

General Health
General Health
Impact
Highest effect
A+ Goal FitB Strength of SupportC CoverageA Formula Quality
Vitamin D · 2000 IU

Vitamin D3 supports foundational bone, immune, and muscle functions. The single vitamin influences bone, immune, and muscle pathways but does not fill multiple nutrient gaps.

The listed 2,000 IU of vitamin D3 fits the preferred daily range. Cholecalciferol is the preferred D3 form and its amount is clear, but no oil carrier or raw source is disclosed.

Study evidence
Vitamin D Supportive 115 studies
Immunity
Immunity
Impact
Highest effect
A Goal FitB+ Strength of SupportD+ CoverageA Formula Quality
Vitamin D · 2000 IU

Vitamin D3 directly supports immune-cell signaling and barrier function, and the listed 2,000 IU amount fits a useful daily range. Cholecalciferol is the preferred common vitamin D form.

The dry tablet lacks a disclosed oil carrier, which may reduce absorption compared with an oil-based format. As a single nutrient, it provides focused vitamin D support without covering other immune pathways.

Study evidence
Vitamin D Supportive 85 studies
Anti-Inflammatory Support
Anti-Inflammatory Support
Impact
High effect
B+ Goal FitB+ Strength of SupportD CoverageA+ Formula Quality
Vitamin D · 2000 IU

Vitamin D3 directly supports immune regulation and is well aligned with inflammatory balance. The listed 2,000 IU serving falls within a practical daily range.

The dry tablet does not identify an oil carrier or raw vitamin source, limiting absorption and sourcing detail. The single-nutrient formula provides depth in one immune-signaling pathway rather than broad anti-inflammatory coverage.

Study evidence
Vitamin D Supportive 101 studies
Anti-Aging
Anti-Aging
Impact
High effect
B+ Goal FitB- Strength of SupportB- CoverageA Formula Quality
Vitamin D · 2000 IU

Vitamin D3 supports bone, muscle, immune, and mood-related functions that often become more important with age. It is a foundational nutrient rather than a targeted intervention for mitochondrial decline or other specialized aging mechanisms.

The ingredient data lists 2,000 IU while the product name states a lower amount, so the physical label should be checked before dosing. Cholecalciferol is a useful form, but the dry tablet has no disclosed lipid carrier or raw-source detail.

Study evidence
Vitamin D Supportive 50 studies
Testosterone Support
Testosterone Support
Impact
High effect
A- Goal FitB- Strength of SupportD- CoverageA+ Formula Quality
Vitamin D · 2000 IU

Vitamin D3 provides a foundational nutrient involved in normal endocrine function. The 2000 IU amount matches the stated target for foundational support.

The product name states 1000 IU while the supplied ingredient data lists 2000 IU, weakening dose confidence. The single-nutrient design provides depth in one pathway rather than broad hormone support.

Study evidence
Vitamin D Supportive 56 studies
Energy
Energy
Impact
High effect
C+ Goal FitB- Strength of SupportD CoverageB Formula Quality
Vitamin D · 2000 IU

Vitamin D3 may support fatigue related to low vitamin D status, but it is not a broad or immediate energy aid. The listed ingredient amount is within a common daily supplemental range.

A dry format with no lipid carrier may reduce absorption compared with an oil-based delivery. The conflict between the product name and listed ingredient amount weakens dose clarity.

Study evidence
Vitamin D Supportive 32 studies

Ingredients

IngredientAmount per serving
Vitamin D3 (Cholecalciferol)
 2000 IU
Gluten Free Adults 18–50 Dairy Free Sugar Free
Report overview
Vitamin D (Cholecalciferol) · 2000 IU OverallScore72
B- Active Ingredient Quality & BioavailabilityC+ Dose, Safety & Label TransparencyB+ Value

The listed 2,000 IU of vitamin D3 fits the preferred daily range. A dry tablet and undisclosed raw source limit the absorption and sourcing profile. Cost efficiency is good, although qualifying independent verification is not provided.

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<p>Clear active disclosure and a focused cholecalciferol supplement make dosing more predictable. The clearly stated 2000 IU amount avoids the conflict between the original product name and ingredient panel. Complete excipient and usage details are still not provided.</p>
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Liquid Vitamin D3 Drops 1000 IU Natural Citrus Flavor

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87 Budget

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<p>A much lower serving cost comes with an absorption-friendly cholecalciferol softgel. The clearly stated 1000 IU amount avoids the conflict between the original product name and ingredient panel. The amount is lower than the original ingredient panel and may not match the intended dose.</p>
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D3 Supplement 1000 IU

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<p>Strong serving value and a focused lanolin-derived vitamin D3 formula provide a practical focused option. The clearly stated 1000 IU amount avoids the conflict between the original product name and ingredient panel. The amount is lower than the original ingredient panel and may not match the intended dose.</p>
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Extra Strength Liquid Vitamin D3

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<p>Strong serving value and a simple cholecalciferol formula provide a practical focused option. The clearly stated 2000 IU amount avoids the conflict between the original product name and ingredient panel. Complete excipient and usage details are still not provided.</p>
Report alternatives

Sources

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

  1. Vitamin D and risk of cause specific death: systematic review and meta-analysis of observational cohort and randomised intervention studies.
    Chowdhury R; Kunutsor S; Vitezova A; Oliver-Williams C; Chowdhury S; Kiefte-de-Jong JC; Khan H; Baena CP; Prabhakaran D; Hoshen MB; Feldman BS; Pan A; Johnson L; Crowe F; Hu FB; Franco OH · BMJ (Clinical research ed.) · 2014
    Meta-analysis95 studies pooledGeneral Health forVitamin D
  2. Vitamin D for the Prevention of Disease: An Endocrine Society Clinical Practice Guideline.
    Demay MB; Pittas AG; Bikle DD; Diab DL; Kiely ME; Lazaretti-Castro M; Lips P; Mitchell DM; Murad MH; Powers S; Rao SD; Scragg R; Tayek JA; Valent AM; Walsh JME; McCartney CR · The Journal of clinical endocrinology and metabolism · 2024
    Guideline / consensusGeneral Health forVitamin D
  3. 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
  4. 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
  5. 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
  6. 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
  7. 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
  8. 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
  9. 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
  10. 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
  11. 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
  12. 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
  13. 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
  14. 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
  15. 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
  16. 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
  17. 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
  18. 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
  19. 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
  20. 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
  21. 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
  22. 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
  23. 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
  24. 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
  25. 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
  26. 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
  27. 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
  28. 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
  29. 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
  30. 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
  31. 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
  32. 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