Lutein is a carotenoid that collects in the macula of the human eye, where it filters blue light and acts as an antioxidant. You get it from leafy greens, eggs, and brightly colored vegetables.
People take lutein to maintain sharp central vision and to guard the eyes against the effects of aging. Some evidence points to a benefit for skin, helping it resist UV-induced stress.
Lutein absorbs best when taken with a meal containing fat. A typical dose comes once a day, often paired with zeaxanthin. The compound is well tolerated. Very high intake can temporarily tint the skin yellow, a harmless effect called carotenoderma. No significant drug interactions are documented, but anyone pregnant or nursing should talk to a doctor before using it.