Cellular Protection. Potent Free Radical Neutralizer. Supports Balanced Immune System Responses. 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. - Potent Free Radical Neutralizer. - Supports Balanced Immune System Responses. 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.