Vitamin A is important to the body. It isn’t only a single compound, it comes in various forms. It comes in the form of alcohol as retinol, as well as aldehyde in the form of retinal. It also comes in the form of acid which is retinoic acid.

Vitamin A contains a Beta-ionone ring which is attached to an isoprenoid chain. This is the normal structure of the Vitamin A nutrient. Retinol is the animal form and is a fat-soluble and anti-oxidant vitamin that is important to a persons vision as well as bone growth.

It is a retinoid that is chemically related to one another. This is also used in medicines.