Astaxanthin is a red carotenoid pigment from microalgae, yeast, salmon, and shrimp. It works as an antioxidant that outperforms vitamin C and beta-carotene in lab measures of free radical quenching. Because it is fat-soluble, you absorb it best when you take it with a meal that includes some fat. A single daily softgel or capsule with food is the most common routine. Noticeable effects come with steady use, not overnight.
People reach for astaxanthin to help shield skin from everyday sun exposure and to ease joint stiffness after workouts. Its structure lets it cross into the brain and eyes, so it is also taken to support long-term vascular, cognitive, and visual health by reinforcing the body's natural cellular protection.
Red stool can happen and is harmless. Watch for possible shifts in blood pressure or cholesterol levels if you take related medications. Because astaxanthin influences the immune system, it could theoretically blunt the effect of immunosuppressant drugs. Anyone pregnant or nursing should check with their doctor before starting.