Health Benefits of Vitamin A
http://www.encompassnutrients.com/complete-adult-product/ Vitamin A is key for good vision, a healthy immune system, and cell growth. There are two types of vitamin A. This entry is primarily about the active form of vitamin A — retinoids — that comes from animal products. Beta-carotene is among the second type of vitamin A, which comes from plants.
Source: Health Benefits of Vitamin A