Vitamin A is an essential nutrient, required for normal vision and for healthy skin and mucous membranes. It is also needed by the thymus gland. Beta carotene is a nontoxic precursor ("building block”) of vitamin A and a major component of the body’s natural antioxidant defenses. Ingredients: Vitamin A (Beta Carotene) 15,000 IU Vitamin A (Palmitate) 10,000 IU (Total Vitamin A Activity) (25,000 IU).