(Carotenoids, Retinol, Miracle vitamin)
Vitamin A is a generic name that applies to all compounds that exhibit biological activity of retinol. In recent years, we also use the name of retinoids to describe the natural forms and synthetic analogues of retinol. Among many of these compounds, the most important are two natural forms: vitamin A1 (retinol), derived from the marine fish liver, and vitamin A2 (3-dehidroretinol), derived from unleavened fish liver.
Between 1913 and 1915 McCollum, Davis, Osborne and Mendel were established the role of vitamin A, and marked it as a factor necessary for human life. It was found that the vitamin activity in food products depends directly on the pigment content of carotene in foods. This vitamin is also called the "miracle vitamin" because of its enormous significance for the organism. Previously, he had the name of "anti-infective vitamin".
It is presumed that this vitamin is needed by all vertebrates to their life, growth, reproduction, vision, maintenance of cells, etc.
This vitamin has also some anti-tumor properties. It has previously been shown to have a prominent immune-stimulating effects in the body as well as curative and restorative effects on the skin.