Thanks for your post! Astaxanthin is one of many naturally occurring carotenoid antioxidants. It is found primarily in marine organisms such as salmon, shrimp, lobster, and trout, and in microalgae. Although generally considered safe to take, research on its effectiveness for many conditions is still in the “insufficient” phase to be advised to take it on its own, but it can be taken in combination with other antioxidants for overall health benefits, or eaten in foods in which it naturally occurs. Hope that helps! -Zoe