Astaxanthin is a powerful antioxidant found in nature with 100-500 times more free radical-fighting power than vitamin E. Research shows it may help protect skin from sun damage and support eye and heart health, though most studies so far have been done in labs rather than on real people.

This was a review study that looked at existing research on astaxanthin, focusing particularly on human clinical trials to separate what actually works in people from what only works in test tubes.

Funding not disclosed in abstract