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Vitamin A is the generic term for a group of fat-soluble compounds highly important for human health. Vitamin A compounds are found in both animal and plant foods and come in two different forms: preformed vitamin A and provitamin A. Preformed vitamin A is known as the active form of the vitamin, which your body can use just as it is. Provitamin A carotenoids — alpha-carotene, beta-carotene and beta-cryptoxanthin — are the inactive form of the vitamin found in plants. These compounds are converted to the active form in your body. For example, beta-carotene is converted to retinol an active form of vitamin A in your small intestine 2. Vitamin A is essential for preserving your eyesight. The vitamin is needed to convert light that hits your eye into an electrical signal that can be sent to your brain.