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Vitamin A is a fat-soluble vitamin and an essential nutrient for animals. The term "vitamin A" encompasses a group of chemically related organic compounds that includes retinol , retinal (also known as retinaldehyde), retinoic acid , and several provitamin (precursor) carotenoids , most notably beta-carotene .
D014807. Legal status. In Wikidata. Vitamin D is a group of fat-soluble secosteroids responsible for increasing intestinal absorption of calcium, magnesium, and phosphate, and for many other biological effects. [1] [2] [3] In humans, the most important compounds in this group are vitamin D 3 ( cholecalciferol) and vitamin D 2 ( ergocalciferol ).
Retinol, also called vitamin A1, is a fat-soluble vitamin in the vitamin A family that is found in food and used as a dietary supplement. [2] Retinol or other forms of vitamin A are needed for vision, cellular development, maintenance of skin and mucous membranes, immune function and reproductive development. [2]
Vitamins A, D, E, and K are fat-soluble, meaning they can dissolve in fats and oils, and are stored in your liver and fatty tissue. “If you’re taking too much over time, you can get higher ...
Most multivitamins contain vitamins A, D, E, K, C, B, calcium, ... Eating whole foods instead of vitamins also allows you to reap the other benefits of a given ingredient. For example, rather than ...
Deficiency (<50 nmol/L): Europe 40%, US 24%, Canada 37% [2] Vitamin D deficiency or hypovitaminosis D is a vitamin D level that is below normal. It most commonly occurs in people when they have inadequate exposure to sunlight, particularly sunlight with adequate ultraviolet B rays (UVB).
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