Astaxanthin performs an important role in healthy immune system responses.* NOW® Astaxanthin has has over twice the astaxanthin (10 mg per softgel) than our regular strength product (4 mg per softgel), and has naturally occurring lutein, canthaxanthin, and beta-carotene. NOW® uses AstaReal® Astaxanthin, the most studied brand of natural astaxanthin from algae which is supported by more than 150 studies, including over 70 human clinical studies.