Vitamin A is a group of unsaturated nutritional organic compounds, that includes retinol, retinal, retinoic acid, and several provitamin A carotenoids, and beta-carotene. Vitamin A has multiple functions: it is important for growth and development, for the maintenance of the immune system and good vision. Vitamin A is needed by the retina of the eye in the form of retinal, which combines with protein opsin to form rhodopsin, the light-absorbing molecule necessary for both low-light and color vision. Vitamin A also functions in a very different role as retinoic acid , which is an important hormone-like growth factor for epithelial and other cells.As a professional Vitamin A supplier and manufacturer,Foodchem International Corporation has been supplying qualityVitamin A 500to customers all over the world for over 10 years.If you have any questions or wish to receive a quote, please feel free to reach us by email:inquiry@foodchem.cnor by phone: +86 21 2206 3075. Our sales person will get back to you in 1 working day.