Brand: 21st Century

Tablet or PillOff Market
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Net Contents

400 Tablet(s)

Serving Size

1 Tablet(s)

Servings Per Container

Not specified

Supplement Form

Tablet or Pill

Bar Code (UPC/SKU)

7 40985 27531 3

Product Version

Not specified

Suggested Use

Directions: As a calcium supplement; adults take one (1) tablet with any meal; twice daily or as directed by a healthcare provider. Do not exceed recommended dosage.

Market Reference

$2.95 – $69.99· 40 listings
  • 21st Century Calcium Supplement Tablets

    Walmart - Thrifty White Health4.8(1800)
    $17.12
  • 21st Century Calcium 600 + D3 Plus Minerals Caplets

    iHerb4.8(364)
    $5.49
  • 21st Century Calcium 600 + D3 Chewable Tablets

    21st-century-vitamins4.4(96)
    $9.99
  • 21st Century Tablets D3 500

    Target4.8(208)
    $13.99
  • 21st Century D3 Tablets

    Target4.8(511)
    $12.84
  • 21st Century 600+D3 Plus Minerals 120 Tablets

    GoSupps.com4.8(364)
    $24.99
  • 21st Century Calcium Supplement Tablets 600 mg 75 Tablets

    21st-century-vitamins4.7(1500)
    $4.99
  • 21st Century Cal Mag Zinc + D3 Tablets

    Swanson Health Products4.7(40000)
    $5.49

Where to Buy Locally

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Research & Studies

  • The vitamin D deficiency pandemic: a forgotten hormone important for health

    MF Holick - Public health reviews, 2010 - Springer

    … of newborns were vitamin D deficient even though the women were ingesting ~600 IU of vitamin … In: Vitamin D and health in the 21st century: bone and beyond. Am J Clin Nutr. 2004;80:…

    2010259 citations
  • Vitamin D: a critical and essential micronutrient for human health

    I Bendik, A Friedel, FF Roos, P Weber… - Frontiers in …, 2014 - frontiersin.org

    … 3 , calcium and bone metabolism can be considered to be secured with highest priority, therefore, it might be speculated that the 600–800 IU intake would satisfy this vitamin D 3 serum …

    2014336 citations
  • The emerging role of vitamin D3 in women's health

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

    … D has emerged as one of the most controversial nutrients and prohormones of the 21st century, … with a daily intake of <600 mg of calcium and <400 IU of vitamin D [25]. Another study on …

    201324 citations
  • McCollum Award Lecture, 1994: vitamin D—new horizons for the 21st century

    MF Holick - The American journal of clinical nutrition, 1994 - Elsevier

    … D is absolutely essential for the maintenance of a healthy … that vitamin D insufficiency and vitamin D deficiency in elderly … the vitamin D requirement is at least 15 µg (600 IU)/d. The skin …

    19941,074 citations
  • Benefits and requirements of vitamin D for optimal health: a review

    WB Grant, MF Holick - Altern Med Rev, 2005 - anaturalhealingcenter.com

    … for children and younger adults, 400 IU/day for those ages 51-70, and 600 IU/day for those … Vitamin D and health in the 21st century: bone and beyond. Executive summary. Am J Clin …

    2005895 citations
  • Vitamin D: evidence-based health benefits and recommendations for population guidelines

    WB Grant, SJ Wimalawansa, P Pludowski, RZ Cheng - Nutrients, 2025 - mdpi.com

    … This study reviews the myriad health benefits of vitamin D, supporting the need to update vitamin D-… These guidelines recommend a supplementation of 600–800 IU/day of vitamin D and …

    2025162 citations

Data sourced from the U.S. National Institutes of Health, Office of Dietary Supplements Dietary Supplement Label Database (DSLD) · Label entered 2019-10-23. DSLD Label ID: 207528. 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.