Miami dentists are often asked questions regarding overall health and nutrition. "What does vitamin A do?" is a common inquiry, as the nutrient is widely available in a range of supplements and natural foods. To start, vitamin A was the first vitamin to be discovered in the early 1900s. It is a fat-soluble vitamin-- meaning that it needs fat to be used by your body, and it can be stored in your fat cells for later use. It is also known as retinol because it produces pigments in the eye’s retina.