D-400

Suggested Use

Directions: As a dietary supplement; take one (1) tablet daily with any meal for maximum daily results; or as directed by your healthcare provider. Do not exceed recommended dosage.

• 

  21st Century D3-400 Tablets

  21st-century-vitamins4.8(509)

  $4.99
• 

  21st Century Chewable D3 Tablets

  iHerb4.8(709)

  $4.99
• 

  21st Century Tablets D3 500

  Target4.8(208)

  $13.99
• 

  21st Century Calcium 500 + D3 400 Tablets

  21st-century-vitamins4.8(1400)

  $10.99
• 

  21st Century Chewable Tablets

  Walmart - myREVCO4.8(709)

  $14.92
• 

  21st Century D3 Tablets

  Target4.8(511)

  $12.84
• 

  21st Century Calcium Citrate + D3 Maximum

  21st-century-vitamins4.8(4200)

  $20.99
• 

  21st Century Softgels

  Walmart - Thrifty White Health4.8(5400)

  $11.28

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.

• ultimate vitamins plus

  5.0 (19)

  Vitamin & supplements store

  154 Main St, North Andover, MA 01845

  Directions(978) 539-8027

• The Vitamin Shoppe

  3.5 (64)

  Vitamin & supplements store

  300 Andover St #114, Peabody, MA 01960

  Directions(978) 532-1199

• The Vitamin Shoppe

  4.2 (78)

  Vitamin & supplements store

  735 Broadway, Saugus, MA 01906

  Directions(781) 231-7424

• Dr. Ed's Nutrition Shoppe

  4.9 (54)

  Vitamin & supplements store

  1775 Washington St Ste 820, Hanover, MA 02339

  Directions(508) 470-7825

• The Vitamin Shoppe

  4.3 (69)

  Vitamin & supplements store

  23 Mystic View Rd, Everett, MA 02149

  Directions(617) 387-1595

• The Vitamin Shoppe

  4.0 (98)

  Vitamin & supplements store

  291 S Broadway, Salem, NH 03079

  Directions(603) 890-4669

• The Vitamin Shoppe

  4.5 (106)

  Vitamin & supplements store

  274 Daniel Webster Hwy, Nashua, NH 03060

  Directions(603) 888-2631

• The Vitamin Shoppe

  4.2 (49)

  Vitamin & supplements store

  435 Winthrop Ave, Lawrence, MA 01843

  Directions(978) 681-9162

• The emerging role of vitamin D3 in women's health

  SS Khadilkar - The Journal of Obstetrics and Gynecology of India, 2013 - Springer

  … nutrients and prohormones of the 21st century, and a lot of … specific recommendation of a daily supplement of 400 IU (10 … A Dutch study with vitamin D 400 IU over 3.5 years showed …

  201324 citations

• Vitamin D in health and disease: current perspectives

  R Zhang, DP Naughton - Nutrition journal, 2010 - Springer

  … healthy elderly women treated with a high calcium intake, daily supplementation with vitamin D 400 IU … One study revealed that women who used supplemental vitamin D (> 400 IU/day) …

  2010577 citations

• Vitamin D deficiency in the 21st century: a persistent problem among Canadian infants and mothers

  LM Ward - Cmaj, 2005 - cmaj.ca

  … age-old public health problem. It was first described, as rickets, in the mid-17th century by … can be maintained through the intake of supplements and of foods that contain natural or …

  2005112 citations

• Implementation strategies for improving vitamin D status and increasing vitamin D intake in the UK: current controversies and future perspectives: proceedings of the …

  JL Buttriss, SA Lanham-New, S Steenson… - British Journal of …, 2022 - cambridge.org

  … Mandatory monitoring of adherence to supplements at child health surveillance visits will prompt healthcare professionals to check and recommend supplements. Dr Uday suggested …

  202263 citations

• Dietary strategies to maintain adequacy of circulating 25-hydroxyvitamin D concentrations

  M Kiely, LJ Black - Scandinavian journal of clinical and laboratory …, 2012 - Taylor & Francis

  … due to the use of dietary supplements, which is seen as a health-promoting behavior. The report … a stronger “intention to eat healthy” were more likely to be users of dietary supplements. …

  2012163 citations

• Role of fatty acids and micronutrients in healthy ageing: a systematic review of randomised controlled trials set in the context of European dietary surveys of older …

  CHS Ruxton, E Derbyshire… - Journal of human …, 2016 - Wiley Online Library

  … and support healthy ageing. This could involve the judicious use of supplements alongside … Thus, the ageing population could be the greatest healthcare challenge of the 21st Century …

  201656 citations

Data sourced from the U.S. National Institutes of Health, Office of Dietary Supplements Dietary Supplement Label Database (DSLD) · Label entered 2012-08-24. DSLD Label ID: 11178. 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.