Astaxanthin

Astaxanthin is a keto-carotenoid pigment biosynthesized by the freshwater microalgae Haematococcus pluvialis, which produces it as a protective mechanism against environmental stress. This lipophilic molecule features a unique molecular structure with hydroxyl and keto groups on its ionone rings, giving it superior antioxidant capacity compared to other carotenoids—it can quench singlet oxygen and neutralize free radicals from both ends of its molecule simultaneously. Formulators prize astaxanthin not only for its exceptional antioxidant potency but also for its ability to integrate into cell membranes where it provides protection against lipid peroxidation, plus its natural red-orange color that can impart a healthy glow to cosmetic formulations without synthetic dyes.