Natural Beta-Carotene contains additional antioxidant carotenoids, Alpha-Carotene, Zeaxanthin, Cryptoxanthin and Lutein as naturally occurring in D. salina sea algae. This natural balance of related carotenoids is what makes this product more bioavailable than common synthetic Beta-Carotene. Natural Beta-Carotene is a fat soluble food source of pro-Vitamin A.