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  2. Vitamin - Wikipedia

    en.wikipedia.org/wiki/Vitamin

    Then, starting in 1935, commercially produced tablets of yeast-extract vitamin B complex and semi-synthetic vitamin C became available. [8] This was followed in the 1950s by the mass production and marketing of vitamin supplements , including multivitamins , to prevent vitamin deficiencies in the general population. [ 8 ]

  3. 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 ]

  4. 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. [189] Vitamin D 2 (ergocalciferol) is produced in a similar way using ergosterol from yeast as a ...

  5. The best vitamins for your immune system - AOL

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

    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.

  6. Human nutrition - Wikipedia

    en.wikipedia.org/wiki/Human_nutrition

    The Recommended Dietary Allowance (RDA) for vitamin B12 is 0.9-2.4 μg/day, while the estimated average requirement in the U.S. and Canada is 0.7-2 μg/day. Elderly individuals with plasma vitamin B12 levels below 148 pmol/L are considered severely deficient, and those with levels between 148 and 221 pmol/L are marginally deficient.

  7. Nicotinamide adenine dinucleotide - Wikipedia

    en.wikipedia.org/wiki/Nicotinamide_adenine_di...

    The three vitamin precursors used in these salvage metabolic pathways are nicotinic acid (NA), nicotinamide (Nam) and nicotinamide riboside (NR). [6] These compounds can be taken up from the diet and are termed vitamin B 3 or niacin. However, these compounds are also produced within cells and by digestion of cellular NAD +.

  8. Vitamin D Won’t Prevent Falls, Fractures In Older Adults ...

    www.aol.com/lifestyle/vitamin-d-won-t-prevent...

    The U.S. Preventive Services Task Force say vitamin D supplements do not reduce the risk of falls or bone fractures in healthy older adults. The draft recommendation notes vitamin D can be helpful ...

  9. 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.

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