Vitamin A supplements

Vitamin A is the name of a fat-soluble retinol-like substance that is stable to heat, acids and alkalis and is easily oxidised. There are two types of vitamin A. Vitamin A alcohol, which is found only in animal foods, is the original form of vitamin A. Carotenoids, which can be ingested from either plant or animal foods, are converted to retinol in the body at levels that vary from person to person. Vitamin A contains photoreceptors (i.e., retinoids) that help create the retina, which is important for night vision; promotes growth and development; and maintains normal skin and mucous membranes and a functioning immune system.