LETS TALK ABOUT VITAMINS: A, D, E, K (Fat soluble vitamins). ✔ CAROTENE ( vitamin A ; includes retinol, retinal, retinyl esters, and retinoic acid and are also referred to as "preformed" vitamin A. Beta carotene can easily be converted to vitamin A as needed.) The benefits of Vitamin A: Essential for vision Lycopene may lower prostate cancer risk. Keeps tissues and skin healthy. Plays an important role in bone growth and in the immune system. Diets rich in the carotenoids alpha carotene and lycopene seem to lower lung cancer risk. Carotenoids act as antioxidants. Foods rich in the carotenoids lutein and zeaxanthin may protect against cataracts Did you know? Many people get too much preformed vitamin A from food and supplements. Large amounts of supplemental vitamin A (but not beta carotene) can be harmful to bones. SOURCES: Sources of retinoids: beef liver, eggs, shrimp, fish, fort