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Natural Biology recommends the following links for more research into Natural Vitamins:

  • (Current information about cancer from the National Cancer Institute)

  • Dietary guidelines published jointly every 5 years by the Department of Health and Human Services (HHS) and the Department of Agriculture (USDA).

  • Food and Nutrition Board of the Institute of Medicine
    (Includes tables of Dietary Reference Intakes for Vitamins, Minerals, and Macronutrients)


  • (Health information from the National Library of Medicine)

  • National Institute of Complimentary Medicine (Information for consumers and practitioners on complementary and alternative therapies)

  • National Institute of Health (Information and resources regarding dietary supplements, including
    the IBIDS dietary supplements database)


  • USDA Nutrient Data Lab (Includes a search engine for the nutritional composition of over 7,000 foods)

  • Reference Intakes for Calcium, Phosphorus, Magnesium, Vitamin D, and Fluoride
    (1997)


  • The Linus Pauling Institute Newsletter

  • Podcast on Vitamin D from the Linus Pauling Institute