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[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.
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. [168] Vitamin D 3 is produced photochemically from 7-dehydrocholesterol in the skin of most vertebrate animals, including humans. [169]
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 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.
A healthy diet improves the physical and mental health of an organism. This requires ingestion and absorption of vitamins, minerals, essential amino acids from protein and essential fatty acids from fat-containing food. Carbohydrates, protein and fat play major roles in ensuring the quality of life, health and longevity of the organism. [10]
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.
A vitamin is an organic compound required by an organism as a vital nutrient in limited amounts. [12] An organic chemical compound (or related set of compounds) is called a vitamin when it cannot be synthesized in sufficient quantities by an organism and must be obtained from the diet. The term is conditional both on the circumstances and on ...
Biotin (also known as vitamin B 7 or vitamin H) is one of the B vitamins. [ 1 ] [ 2 ] [ 3 ] It is involved in a wide range of metabolic processes, both in humans and in other organisms, primarily related to the utilization of fats, carbohydrates, and amino acids. [ 4 ]