Other ingredients
Astaxanthin
Names you may see: astaxanthine carotenoid Haematococcus pluvialis microalgae
The quick take
Astaxanthin is a red-orange carotenoid with antioxidant activity. Many supplements obtain it from the microalga Haematococcus pluvialis.
A closer look
What forms will I see on a label?
Check the declared milligrams of astaxanthin, rather than the total algae or oil weight. Capsules and softgels can have different source materials and added ingredients.
Why people use it
Supplement companies promote astaxanthin for antioxidant support, skin and eye wellness, and healthy aging. Some active users choose it for exercise recovery and endurance goals.
These are common goals and marketing uses. The evidence section below explains what research supports.
What does the evidence tell us?
A small placebo-controlled trial found improvements in selected skin responses to UV exposure. This preliminary result does not establish broad anti-aging or sports-performance benefits, and an oral supplement does not replace sunscreen.
What should I know before using it?
Follow the product label rather than assuming a higher amount is more effective. Long-term and pregnancy safety data are limited; seek individual advice during pregnancy or breastfeeding and when taking medication.
Sources & further reading
Published astaxanthin skin trial ↗
Review of astaxanthin skin studies ↗
Content reviewed: October 1, 2026
General educational information. Follow the product label and seek individual advice when needed.