Vitamin A is an indispensable nutrient - without it, the body can't function. It helps boost the immune system, aids in reproduction, helps fabricate blood and bone, and keeps skin healthy. It's known by many names, but the most common is retinol, which might be recognizable as a substantial ingredient in many skin care products. extra forms of vitamin A swell retinal, alpha-carotene, beta-carotene, gamma-carotene, and crypto-carotene.