Vitamin A was one of the first to be discovered. It was obtained in 1934 from the shark's liver. Since then, it has been demonstrated that it has a wide range of positive properties. It is oil soluble. The most biologically active forms of vitamin A are retinol, retinal and retinoic acid.
These forms of vitamin A are naturally present in the products of animal origin (dairy products, liver, fish). Plant products (red pepper, cherries, carrots, spinach) are a source of carotenoids, which are provitamins, because they require a certain conversion to fulfill their role in the body system.
Vitamin A plays an essential role not only at the cellular level, but on the general level of the whole body system. It is contained in the rhodopsin (a pigment in the eye retina), which explains its huge role in the process of seeing. Moreover, it is responsible for the growth of epithelial and bone tissues as well as for the development of reproductive cells.
Vitamin A increases the generation of collagen fibers in the skin, affects the regulation of the exfoliation processes, so that it has an influence on the maintenance of the proper epidermis condition. But that is not all – it has been proven that it shows anti-inflammatory and anti-free-radical properties.