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Super Strength D3-2000 IU

Nature's Bounty
4.8
★ ★ ★ ★ ★
(78159 ratings)
Vitamin D 2000 IU
Product Image
Score85
A practical 2,000 IU D3 softgel combines suitable dosing with good value. Check the original label because the supplied ingredient list duplicates the vitamin D entry.
How scoring works
Quantity:100 Softgel(s) • (100 servings)
Goals:
Immunity
Anti-Inflammatory Support
General Health
Energy
Anti-Aging
Testosterone Support

Score 85

A practical 2,000 IU D3 softgel combines suitable dosing with good value. Check the original label because the supplied ingredient list duplicates the vitamin D entry.
How scoring works
$7.65($0.07 per serving)
iHerb
$ 11.66
Amazon
$ 7.65
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Analysis

Cholecalciferol provides the preferred D3 form at 2,000 IU per softgel. Softgel delivery is a good fit for absorption of this fat-soluble nutrient.

The amount sits in a useful daily range for many adults, though personal need varies with existing intake and measured status. The ingredient data list vitamin D twice in equivalent forms, which appears redundant rather than additive and should be checked on the package.

A long supply at low cost makes the product attractive for routine use. Raw source, complete inactive ingredients, and independent quality verification are not included in the supplied information.

Who is it for
  • Adults seeking a moderate daily D3 amount
  • People who prefer a softgel format
  • Value-focused long-term users
Best for
  • Routine vitamin D maintenance
  • A simple one-active formula
  • Cost-conscious daily use

Pros

  • Uses cholecalciferol
  • Provides a useful 2,000 IU serving
  • Softgel format supports absorption
  • Offers strong serving value

Cons

  • The ingredient entry is duplicated in the supplied data
  • Raw source is not disclosed
  • Complete inactive ingredients are unavailable
  • Independent verification is not identified

Warnings

  • Verify that the duplicated vitamin D entries describe one 2,000 IU serving rather than two separate amounts.
  • Include vitamin D from multivitamins and fortified products when calculating total intake.
  • People with high blood calcium, kidney stones, or use of thiazide diuretics or digoxin should review supplemental vitamin D with a clinician.

Nutrient quality

92 Highest impact

Cholecalciferol is a well-regarded and absorbable vitamin D form in a lipid-friendly softgel. The vitamin D amount fits common maintenance use.

.

Ingredient transparency

77 High impact

Duplicate vitamin D entries make the total amount presentation confusing. A complete excipient and carrier list is not available in the supplied data.

.

Customer satisfaction

77 High impact

The average rating is very strong. The large rating volume provides a reliable satisfaction signal.

.

Value for money

96 Highest impact

The supply provides excellent value per effective serving. The formula is not inflated by low-value extras.

.
Report analysis

Goals

Immunity
Immunity
Impact
Highest effect
A Goal FitA+ Strength of SupportC- CoverageA+ Formula Quality
Vitamin D · 2000 IU

Vitamin D3 directly supports immune-cell signaling and provides a useful maintenance amount. Softgel delivery may improve absorption of this fat-soluble vitamin.

The single-nutrient design has strong depth but does not cover barrier, antioxidant, or mineral pathways. The raw vitamin D source is not disclosed, although the active form and amount are clear.

Study evidence
Vitamin D Supportive 85 studies
Anti-Inflammatory Support
Anti-Inflammatory Support
Impact
Highest effect
A Goal FitA+ Strength of SupportC- CoverageA+ Formula Quality
Vitamin D · 2000 IU

Vitamin D3 directly supports immune regulation and may help keep inflammatory signaling balanced, especially when vitamin D status is low. Its human evidence is stronger for correcting inadequacy than for producing the same response in everyone. Softgel delivery supports absorption.

The well-targeted maintenance dose is clearly disclosed and the cholecalciferol form is appropriate. The focused design offers strong depth for one immune pathway but does not cover direct enzyme inhibition, fatty-acid resolution, or broad antioxidant recycling.

Study evidence
Vitamin D Supportive 101 studies
General Health
General Health
Impact
Highest effect
A Goal FitA Strength of SupportC CoverageA Formula Quality
Vitamin D · 2000 IU

Vitamin D3 provides focused support for normal immune function, calcium handling, and skeletal maintenance. The softgel and practical maintenance serving strengthen its fit for routine use.

Raw-source and independent verification details are not provided. Users combining several vitamin D products should account for total daily intake to avoid excessive long-term exposure.

Study evidence
Vitamin D Supportive 115 studies
Energy
Energy
Impact
Highest effect
A Goal FitA Strength of SupportC- CoverageA Formula Quality
Vitamin D · 2000 IU

Vitamin D3 supports immune function, bone maintenance, calcium absorption, and normal muscle activity. The 2,000 IU amount is practical and the softgel supports fat-soluble delivery.

The raw D3 source is not identified, which limits sourcing transparency. Individual benefit still depends on sun exposure, diet, and vitamin D status.

Study evidence
Vitamin D Supportive 32 studies
Anti-Aging
Anti-Aging
Impact
High effect
B- Goal FitA Strength of SupportD CoverageA Formula Quality
Vitamin D · 2000 IU

Vitamin D3 provides focused support for bone strength and immune regulation as people age. Vitamin D has solid human evidence for maintaining bone and immune function when intake or blood levels are low.

The 2000 IU softgel sits within a practical maintenance range for many adults, though personal need still varies. The narrow formula offers depth in one foundational area but does not address most cellular aging pathways.

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

Vitamin D provides a relevant route to testosterone support. Dose or form uncertainty limits confidence in the practical contribution.

The formula remains narrow rather than comprehensive. Super Strength D3-2000 IU is best viewed as targeted support rather than proof of a clinical benefit.

Study evidence
Vitamin D Supportive 56 studies

Ingredients

IngredientAmount per serving
Vitamin D (Cholecalciferol, Vitamin D3)
 2000 IU
Gluten Free Adults 18–50 Dairy Free Sugar Free
Report overview
Vitamin D (Cholecalciferol, Vitamin D3) · 2000 IU OverallScore80
A Active Ingredient Quality & BioavailabilityC+ Dose, Safety & Label TransparencyB+ Value

Vitamin D3 uses the preferred form and the softgel may support absorption, though its raw source is undisclosed. The 2000 IU serving sits within the preferred daily range. No flagged additives are disclosed, but independent verification is absent and cost efficiency is favorable.

View ingredientView products
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86 Performance

Vitamin D-3 2000 IU

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<p>A focused formula supplies 2000 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>
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<p>A focused formula supplies 2000 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>
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Liquid Vitamin D3 Drops 1000 IU Natural Citrus Flavor

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<p>A liquid 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 uses a lower vitamin D amount that may suit routine maintenance better, but may not match a documented high-dose need.</p>
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<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 closely matches the original’s listed vitamin D amount.</p>
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Extra Strength Liquid Vitamin D3

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<p>A focused formula supplies 2000 IU of cholecalciferol without unrelated active ingredients. It costs less per serving than the original and closely matches the original’s listed vitamin D amount.</p>
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<p>A focused formula supplies 1000 IU of cholecalciferol without unrelated active ingredients. The lower serving cost and focused ingredient list improve value, while the dose uses a lower vitamin D amount that may suit routine maintenance better, but may not match a documented high-dose need.</p>
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Vitamin D-3 1000 IU

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<p>A focused formula supplies 1000 IU of lanolin-derived vitamin D3 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 lower vitamin D amount that may suit routine maintenance better, but may not match a documented high-dose need.</p>
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<p>A focused formula supplies 1000 IU of cholecalciferol without unrelated active ingredients. The lower serving cost and focused ingredient list improve value, while the dose uses a lower vitamin D amount that may suit routine maintenance better, but may not match a documented high-dose need.</p>
Report alternatives

Sources

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

  1. 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
  2. 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
  3. 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
  4. 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
  5. 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
  6. 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
  7. 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
  8. 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
  9. 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
  10. 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
  11. 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
  12. 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
  13. 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
  14. 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
  15. 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
  16. 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
  17. 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
  18. 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
  19. 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
  20. 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
  21. 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
  22. 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
  23. 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
  24. 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
  25. 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
  26. 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
  27. 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
  28. 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
  29. 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
  30. 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