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Humans can produce some vitamins from precursors they consume: for example, vitamin A is synthesized from beta carotene; and niacin is synthesized from the amino acid tryptophan. [54] Vitamin C can be synthesized by some species but not by others. Vitamin B 12 is the only vitamin or nutrient not available from plant sources.
Your body also makes vitamin D from sunlight, and your gut bacteria make some vitamin K. By comparison, vitamin supplements contain vitamins in a capsule, tablet, liquid, gummy, or powder form ...
[2] [4] Plants do not need cobalamin and carry out the reactions with enzymes that are not dependent on it. [5] 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]
Vitamin D is produced in the keratinocytes of two innermost strata of the epidermis, the stratum basale and stratum spinosum, which also are able to produce calcitriol and express the vitamin D receptor. [171] Vitamin D 3 is produced photochemically from 7-dehydrocholesterol in the skin of most vertebrate animals, including humans. [172]
Your body doesn’t naturally produce vitamin C, though, so you need to include it in your diet, Berger says. Food sources: Citrus fruits (oranges and grapefruits), berries, tomatoes, melon ...
Vitamin K is a family of structurally similar, fat-soluble vitamers found in foods and marketed as dietary supplements. [1] The human body requires vitamin K for post-synthesis modification of certain proteins that are required for blood coagulation ("K" from Danish koagulation, for "coagulation") or for controlling binding of calcium in bones and other tissues. [2]
Biotin, also known as vitamin B7, is a vitamin that our body needs to make the proteins responsible for supporting hair, nail, and skin health. While we produce it naturally, our bodies may not ...
Because the body does not manufacture certain fatty acids (termed essential fatty acids), they must be obtained through one's diet. Ethanol is not an essential nutrient, but it does provide calories.The United States Department of Agriculture uses a figure of 6.93 kilocalories (29.0 kJ) per gram of alcohol (5.47 kcal or 22.9 kJ per ml ) for ...
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