D3 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: 1 Tablet(s) · 1 per day

Not Present

• 

  Vitamin D3 — The Thompson Clinic

  thethompsonclinic.com

  $26.00
• 

  Thompson's 1000IU 240 Capsules

  Natonic4.8(9)

  $17.41
• 

  Spring Valley Vitamin D3 Softgels

  Walmart4.6(5400)

  $4.88
• 

  Now Vitamin D 3 IU

  Natures Food Markets4.8(2000)

  $5.29
• 

  D, Cholecalciferol 1000 IU Thompson 90 Tabs

  Cura3605.0(1)

  $7.99
• 

  Vitamin D3, 400 IU TABLET

  Amazon.com

  $5.40
• 

  Pure Encapsulations Vitamin D3 E. Kapseln

  Covenant Health Products4.8(1200)

  $14.08
• 

  Animal Parade Vitamin D3 400 IU Liquid Drops

  NaturesPlus4.8(156)

  $15.45

Enter your city or ZIP code to find supplement & health stores in your area that may carry this product.

Showing representative supplement & health retailers — search above for stores in your area.

• Nutriburst

  4.6 (30)

  Manufacturer

  8 Waterloo Pl, London SW1Y 4BN

  Directions020 3943 8201

• ITL Health

  5.0 (37)

  Vitamin & Supplements Shop

  50 Broadway, London SW1H 0BL

  Directions0118 321 7628

• Minerva Wellness

  5.0 (21)

  Vitamin & Supplements Shop

  71-75 Shelton St, London WC2H 9JQ

  Directions020 7459 4641

• Holland & Barrett - Strand

  3.7 (51)

  Vitamin & Supplements Shop

  406-408 Strand, London WC2R 0NE

  Directions0330 058 2640

• Vitopia

  4.9 (57)

  Vitamin & Supplements Shop

  18 Wimpole St, London W1G 8GD

  Directions020 7164 6368

• Protiv Nutrition

  5.0 (1)

  Vitamin & Supplements Shop

  3rd Floor, 207 Regent St., London W1B 3HH

  Directions07442 915758

• Indi Supplements

  4.3 (12)

  Vitamin & Supplements Shop

  27 Old Gloucester St, London WC1N 3AF

  Directions

• Dietapplements Limited

  4.8 (6)

  Vitamin & Supplements Shop

  27 Old Gloucester St, London WC1N 3AX

  Directions01892 506990

• Effect of calcium and vitamin D supplementation on blood pressure: the Women's Health Initiative Randomized Trial

  …, LH Kuller, S Wassertheil-Smoller, CA Thomson… - …, 2008 - ahajournals.org

  … The Women’s Health Initiative Calcium/Vitamin D Trial randomly assigned 36 282 postmenopausal women to receive 1000 mg of elemental calcium plus 400 IU of vitamin D3 daily or …

  2008340 citations

• Long-term effect of randomization to calcium and vitamin D supplementation on health in older women: postintervention follow-up of a randomized clinical trial

  CA Thomson, AK Aragaki, RL Prentice… - Annals of internal …, 2024 - acpjournals.org

  … The Women’s Health Initiative (WHI) completed the largest randomized controlled trial (RCT… carbonate and 400 IU of vitamin D 3 , taken in half doses twice daily) on health outcomes in …

  202433 citations

• Long-term supplementation with 3200 to 4000 IU of vitamin D daily and adverse events: a systematic review and meta-analysis of randomized controlled trials

  A Zittermann, C Trummer, V Theiler-Schwetz… - European Journal of …, 2023 - Springer

  … Our meta-analysis indicates that compared with placebo or low-dose (400 IU/d) vitamin D, a supplement of 3200–4000 IU vitamin D daily results in significantly higher risks of …

  202358 citations

• A randomized controlled trial of calcium with vitamin D, alone or in combination with intravenous pamidronate, for the treatment of low bone mineral density associated …

  …, RM Francis, NP Thompson - Alimentary …, 2003 - Wiley Online Library

  … All patients were prescribed one tablet containing 500 mg calcium and 10 µg (400 IU) vitamin D (Calichew D3 Forte, Shire) to be taken every day for 12 months, in line with general …

  2003101 citations

• Vitamin D and health in pregnancy, infants, children and adolescents in Australia and New Zealand: a position statement

  …, RS Mason, JJ McGrath, MJ Thompson… - Medical Journal of …, 2013 - Wiley Online Library

  … health education and advice about sensible sun exposure. Infants at risk of low vitamin D should be supplemented with 400 IU … for low vitamin D, and give 400 IU vitamin D 3 daily to …

  2013238 citations

• Vitamin D3 Supplementation at 4000 International Units Per Day for One Year Results in a Decrease of Positive Cores at Repeat Biopsy in Subjects with Low-Risk …

  DT Marshall, SJ Savage, E Garrett-Mayer… - The Journal of …, 2012 - academic.oup.com

  … However, the interventional arm of the study was negative because of insufficient supplementation: in this study, 400 IU/d of vitamin D 3 for 7 yr as a treatment would have been …

  2012192 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 2014-08-26. DSLD Label ID: 36356. 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.