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  2. Vitamin - Wikipedia

    en.wikipedia.org/wiki/Vitamin

    The body's stores for different vitamins vary widely; vitamins A, D, and B 12 are stored in significant amounts, mainly in the liver, [20] and an adult's diet may be deficient in vitamins A and D for many months and B 12 in some cases for years, before developing a deficiency condition.

  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. [186] 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. Vitamin A - Wikipedia

    en.wikipedia.org/wiki/Vitamin_A

    Vitamin A toxicity also referred to as hypervitaminosis A, occurs when there is too much vitamin A accumulating in the body. Symptoms may include nervous system effects, liver abnormalities, fatigue, muscle weakness, bone and skin changes, and others. The adverse effects of both acute and chronic toxicity are reversed after consumption of high ...

  7. Vitamin C - Wikipedia

    en.wikipedia.org/wiki/Vitamin_C

    SVCTs are the predominant system for vitamin C transport within the body. [57] In both vitamin C synthesizers (example: rat) and non-synthesizers (example: human) cells maintain ascorbic acid concentrations much higher than the approximately 50 micromoles/liter (μmol/L) found in plasma.

  8. 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 ...

  9. 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 ...

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