Vitamin D 400 IU®

Objective insights generated automatically from the official DSLD label — a quick, factual read of how this product is formulated and disclosed.

This analysis is generated algorithmically from label data for educational reference only. It is not a product endorsement, ranking, or medical advice.

Serving Size: 2 Tablet(s) · 1 per day

Not Present

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  Nature's Blend Vitamin D 400 IU

  Target5.0(6)

  $7.16
• 

  Nature's Blend Vitamin D 400 IU Body Immunity Essential Nutrient

  Walmart - Pharma Frills5.0(1)

  $9.54
• 

  Nature's Blend 400IU Drops

  Herbs Direct

  $9.39
• 

  Nature's Truth D3 400IU Tablets

  Rogersville Pharmacy4.2(17)

  $4.99
• 

  Vitamin D3 IU

  My Nature's Delight

  $10.99
• 

  Nature's measure vitamin D 400IU

  Main Market Online

  $4.80
• 

  Nature's Truth High Potency Tablets

  Walmart - Pharma Frills5.0(7)

  $9.36
• 

  Nature's Plus Vitamin D3 400 IU Water-Dispersible

  NaturesPlus4.7(88)

  $7.95

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• The Sunlight Solution: Reclaiming Vitamin D, Reversing the Chronic Disease Epidemic, and Making America Healthy Again

  WF Supple - 2026 - books.google.com

  … vitamin D meter to gauge how much to take. The recommended dietary allowance (RDA) of vitamin D back then was 400 international units (IU… organism living in harmony with its solar …

  2026

• Why Vitamin D Fails to Rise in Many People: New Evidence-and How Orthomolecular Medicine Solves It

  RZ Cheng - grassrootshealth.net

  … Millions of people take Vitamin D or spend time in the sun, yet their blood Vitamin D levels barely improve. Others supplement modestly and reach optimal levels quickly. …

• Studies on the synergistic Interplay of Vitamin D and K for Improving Bone and Cardiovascular Health.

  V Singh, S Jain, S Prakash… - Current Research in …, 2022 - openurl.ebsco.com

  … effects of co-supplementing Vitamin D and K on bone and … upon the dual supplementation of Vitamin D and K, which has … showed that Vitamin D work in synergy with Vitamin K and …

  202218 citations

• Optimal nutritional status for a well-functioning immune system is an important factor to protect against viral infections

  P Calder, AC Carr, AF Gombart, M Eggersdorfer - Nutrients, 2020 - eprints.soton.ac.uk

  … have vitamin D receptors that affect their function after ligand binding, and as such vitamin D … A review of micronutrients and the immune system–working in harmony to reduce the risk of …

  20201,409 citations

• The health benefits of solar irradiance and vitamin D and the consequences of their deprivation

  WB Grant - Clinical Reviews in Bone and Mineral Metabolism, 2009 - Springer

  … risk of rickets, the benefits of vitamin D were extended in the past three … vitamin D is production by solar ultraviolet B (UVB) irradiance. In this paper, evidence is reviewed that vitamin D …

  200915 citations

• Vitamin D on COVID-19 Patients During the Pandemic, 2022. A Systematic Review and Meta-Analysis.

  MM Asla, AA Nawar, E Elsayed… - … in Nutrition & …, 2023 - foodandnutritionjournal.org

  … Vitamin D is a fat-soluble vitamin obtained through diet, sunlight, and dietary supplements.Calcitriol (1,25-dihydroxy vitamin D3) is the active form of Vit-D that … Vit-D improves innate …

  20235 citations

• Vitamin D: What the Label Numbers Mean

  How to read vitamin D amounts on a Supplement Facts panel, the IU-to-mcg conversion, and why %DV matters.

  VitaSuppTrack Editorial· Jun 24, 2026

Data sourced from the U.S. National Institutes of Health, Office of Dietary Supplements Dietary Supplement Label Database (DSLD) · Label entered 2013-05-24. DSLD Label ID: 21872. This information is provided for educational reference only and is not medical advice. Always follow the product label and consult a doctor or pharmacist before use.