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  2. Vitamin - Wikipedia

    en.wikipedia.org/wiki/Vitamin

    [12] [20] For vitamin C, the first symptoms of scurvy in experimental studies of complete vitamin C deprivation in humans have varied widely, from a month to more than six months, depending on previous dietary history that determined body stores. [55] Deficiencies of vitamins are classified as either primary or secondary.

  3. Vitamin D - Wikipedia

    en.wikipedia.org/wiki/Vitamin_D

    Vitamin D 3 (cholecalciferol) is produced industrially by exposing 7-dehydrocholesterol to UVB and UVC light, followed by purification. The 7-dehydrocholesterol is sourced as an extraction from lanolin, a waxy skin secretion in sheep's wool. [186] Vitamin D 2 (ergocalciferol) is produced in a similar way using ergosterol from yeast as a ...

  4. Vitamin B12 - Wikipedia

    en.wikipedia.org/wiki/Vitamin_B12

    Vitamin B 12 is the most chemically complex of all vitamins, [6] and for humans the only vitamin that must be sourced from animal-derived foods or supplements. [ 2 ] [ 7 ] Only some archaea and bacteria can synthesize vitamin B 12 . [ 8 ]

  5. Human nutrition - Wikipedia

    en.wikipedia.org/wiki/Human_nutrition

    Vitamin A plays an essential role in developing the immune system in children, therefore, it is considered an essential micronutrient that can greatly affect health. [2] However, because of the expense of testing for deficiencies, many developing nations have not been able to fully detect and address vitamin A deficiency, leaving vitamin A ...

  6. The best vitamins for your immune system - AOL

    www.aol.com/lifestyle/8-vitamins-ultimate-immune...

    Vitamin B6. Vitamin B6 helps regulate the immune system.It spurs the production of white blood cells and T-cells that help your body fight bacteria, viruses, and other harmful substances.

  7. B vitamins - Wikipedia

    en.wikipedia.org/wiki/B_vitamins

    Vitamin B 10: para-aminobenzoic acid (pABA or PABA), a chemical component of the folate molecule produced by plants and bacteria, and found in many foods. [ 40 ] [ 41 ] It is best known as a UV -blocking sunscreen applied to the skin, and is sometimes taken orally for certain medical conditions.

  8. Nutrient - Wikipedia

    en.wikipedia.org/wiki/Nutrient

    Vitamins occur in a variety of related forms known as vitamers. The vitamers of a given vitamin perform the functions of that vitamin and prevent symptoms of deficiency of that vitamin. Vitamins are those essential organic molecules that are not classified as amino acids or fatty acids.

  9. Is It Safe to Use Expired Vitamins? The Truth About Vitamin ...

    www.aol.com/vitamins-expire-nutritionists-weigh...

    When you buy a bottle of vitamins from a nutrition store, you’ll probably notice a best-by date on the bottom of the jar. But that inscribed number isn’t a hard-and-fast rule—there is some ...

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    related to: vitamins produced by body systems are classified