How to Choose a Vitamin A Supplement Vitamin A is essential for healthy skin and eyes. Also known as retinol, it plays a major role in the proper functioning of your body. This fat-soluble vitamin supports immune function, increases the production of new skin cells, and boosts night vision. Spinach, carrots, kale, sweet potatoes, and liver from beef, chicken, and pork are the best natural sources of vitamin A. This nutrient is also available .