NOW Astaxanthin is a naturally occurring carotenoid that, due to its unique structure, performs an important role in cellular free radical protection and healthy immune system responses.* NOW Astaxanthin is derived from Non-GMO Haematococcus pluvialis microalgae and has naturally occurring lutein, canthaxanthin and beta-carotene. This extra strength product has over twice the Astaxanthin (10 mg per softgel) than our regular strength product (4 mg per softgel).