Astaxanthin is a powerful carotenoid naturally designed to fight free radicals.* Research shows its unique structure helps it travel across the brain-blood and blood-retina barriers, which makes it an ideal choice for eye and central nervous system health.* Plus, studies demonstrate that astaxanthin can maintain the body's balanced immune system.* This NOW product features Zanthin®, which offers superior ocular support and maintains the health of the nervous system.*