Potent Free Radical Scavenger* Healthy Immune System Response* Astaxanthin is a naturally occurring carotenoid with a unique structure that is known to be a potent free radical scavenger.* Because astaxanthin freely crosses the blood-brain and blood-retina barriers, it can neutralize free radicals in the eye and central nervous system.* Scientific studies also demonstrate that astaxanthin can support the body’s healthy and balanced immune system responses.* This NOW product features Zanthin®, which can help to support overall ocular health and promote a healthy nervous system.* Zanthin® is a registered trademark of Valensa International. Natural color variation may occur in this product.