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-retinal 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 Ingredients Natural Astaxanthin (Zanthin) (from Haematococcus pluvialis Extract)Free From Not manufactured with yeast, wheat, gluten, soy, milk, egg, fish, shellfish or tree nut ingredients. Produced in a GMP facility that processes other ingredients containing these allergens.