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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. 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.

  4. Human nutrition - Wikipedia

    en.wikipedia.org/wiki/Human_nutrition

    Except for vitamin D, vitamins are essential nutrients, [64] necessary in the diet for good health. Vitamin D can be synthesized in the skin in the presence of UVB radiation. (Many animal species can synthesize vitamin C, but humans cannot.)

  5. Vitamin D - Wikipedia

    en.wikipedia.org/wiki/Vitamin_D

    Unlike the other twelve vitamins, vitamin D is only conditionally essential - in a preindustrial society people had adequate exposure to sunlight and the vitamin was a hormone, as the primary natural source of vitamin D was the synthesis of cholecalciferol in the lower layers of the skin’s epidermis, triggered by a photochemical reaction with ...

  6. 8 vitamins and supplements for weight loss backed by science

    www.aol.com/8-vitamins-supplements-weight-loss...

    Vitamin D can help with many processes in the body, like building bones and reducing inflammation. It also plays a vital role in processing sugar. It also plays a vital role in processing sugar.

  7. 12 Best Vitamins for Hair Growth - AOL

    www.aol.com/12-best-vitamins-hair-growth...

    2. Vitamin B12. One of eight B-complex vitamins, vitamin B12 is found naturally in some types of fish, red meat and fortified foods.It plays a key role in central nervous system function, DNA ...