utein and zeaxanthin are two closely related carotenoid compounds found in various fruits and vegetables, particularly in leafy green vegetables like spinach, kale, and collard greens, as well as in egg yolks and some fruits.

These compounds are known as xanthophylls and are important antioxidants that help protect the eyes from damage caused by harmful light wavelengths, particularly blue light and ultraviolet (UV) radiation. In the eyes, lutein and zeaxanthin are concentrated in the macula, a small area in the retina responsible for central vision and visual acuity.