Vitamin D-3 400 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.

Allergen flags are parsed automatically from the official label's claims and statements. Always verify against the physical product label before use, especially if you have a severe allergy.

Serving Size: 1 Softgel(s) · 1–2 per day

Not Present

• 

  Now Vitamin D 3 IU

  PureFormulas.com4.8(1900)

  $3.91
• 

  Now Liquid Vitamin D-3

  iHerb4.8(2300)

  $6.14
• 

  NOW Foods Softgels

  NOW4.8(181)

  $7.99
• 

  Now Foods – Vitamin D 3 Iu

  Silkrute

  $20.99
• 

  NOW Vitamine D3 400 IE 180 softgels

  vitadvice.com

  $14.24
• 

  Now Foods 240 Capsules with D3 & K2

  eBay4.8(33000)

  $9.39
• 

  Now Foods Liquid Vitamin

  NOW4.8(2300)

  $7.99
• 

  Now Foods Vitamin D - 3 400 IU Structural Support Soft Gels - 180 Count

  Herbkart.com4.8(1900)

  $29.79

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• The Vitamin Shoppe

  4.3 (142)

  Vitamin & supplements store

  1326 Kings Hwy, Brooklyn, NY 11229

  Directions(718) 382-2535

• The Vitamin Shoppe

  4.4 (122)

  Vitamin & supplements store

  8929 Avenue D C1, Brooklyn, NY 11236

  Directions(718) 629-2076

• Forest Leaf

  4.8 (55)

  Vitamin & supplements store

  2270 59th St, Brooklyn, NY 11204

  Directions(929) 810-5089

• The Vitamin Shoppe

  4.5 (61)

  Vitamin & supplements store

  480 86th St, Brooklyn, NY 11209

  Directions(718) 491-9768

• GNC

  4.2 (77)

  Vitamin & supplements store

  52-10 Bergenline Ave, West New York, NJ 07093

  Directions(201) 392-9555

• The Vitamin Shoppe

  4.3 (183)

  Vitamin & supplements store

  12 4th Ave, Brooklyn, NY 11217

  Directions(718) 858-8314

• The Vitamin Shoppe

  3.9 (84)

  Vitamin & supplements store

  32 Court St, Brooklyn, NY 11201

  Directions(718) 596-0466

• Vitamin D: 100 years of discoveries, yet controversy continues

  JC Gallagher, CJ Rosen - The lancet Diabetes & endocrinology, 2023 - thelancet.com

  … to widespread vitamin D supplementation 200–400 IU daily … ergosterol produces ergocalciferol, now named vitamin D 2 , … We selected controlled trials of vitamin D 3 and D 2 that were …

  2023123 citations

• Long-Term High-Dose Vitamin D3 Supplementation and Blood Pressure in Healthy Adults: A Randomized Controlled Trial

  R Scragg, S Slow, AW Stewart, LC Jennings… - …, 2014 - ahajournals.org

  … to receive either vitamin D 3 200 000 IU for 2 months followed by 100 000 IU monthly up to 18 … , which include giving a vitamin D dose (400 IU per day) that is now considered too low 29 …

  201487 citations

• Hip bone loss is attenuated with 1000 IU but not 400 IU daily vitamin D3: a 1‐year double‐blind RCT in postmenopausal women

  HM Macdonald, AD Wood, LS Aucott… - Journal of bone and …, 2013 - academic.oup.com

  … The aim of this study was to test whether vitamin D 3 supplementation at a daily dose of 400 IU (10 µg) or 1000 IU (25 µg) for 1 year starting in January/February affects bone mineral …

  2013105 citations

• Vitamin D metabolism and guidelines for vitamin D supplementation

  I Ramasamy - The Clinical Biochemist Reviews, 2020 - pmc.ncbi.nlm.nih.gov

  … that are now recognised as important for vitamin D function. … Vitamin D 3 is formed in the skin upon exposure to ultraviolet … 25(OH)D levels to the same levels as 400 IU (10 μg) oral dose. …

  2020265 citations

• Effect of Vitamin D3 Supplementation During Pregnancy on Risk of Persistent Wheeze in the Offspring: A Randomized Clinical Trial

  BL Chawes, K Bønnelykke, J Stokholm, NH Vissing… - Jama, 2016 - jamanetwork.com

  … dose of 2400 IU vitamin D 3 supplementation or matching … supplementation of 400 IU of vitamin D 3 during pregnancy … of 2800 IU/d vs 400 IU/d of vitamin D 3 supplementation. Women …

  2016406 citations

• Vitamin D supplementation: an update

  C Gonzalez - US Pharmacist, 2010 - uspharmacist.com

  … The Women’s Health Initiative found that women taking 400 IU of vitamin D 3 (plus calcium) … contain about 400 IU of vitamin D, but many multivitamins now contain 800 to 1,000 IU. A …

  201017 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 2024-10-24. DSLD Label ID: 314216. 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.