Lutein is a fat-soluble nutrient, so it is recommended to take it after meals for better absorption; taking it at night is more likely to increase the burden on the liver, so it is recommended to take it in the morning, after meals. Lutein is a carotenoid that can only be synthesized in plants and microorganisms. Animals cannot synthesize carotenoids themselves and must take them from outside the body. Lutein exists in all parts of the body, such as eyes, serum, skin, brain, heart, etc. It is especially important for the eyes, as it is an important part of the retinal macular pigment, which can effectively filter blue light, protect the retina, and has antioxidant effects, helping to prevent the hardening of blood vessels. Lutein mainly comes from dark green vegetables, such as pumpkin, broccoli, spinach, olives, etc., you can usually eat more of these vegetables to help supplement from food.