Lutein

About Lutein

Lutein is a xanthophyll, an oxygenated carotenoid whose name comes from the Latin luteus, meaning yellow. Together with its isomer zeaxanthin and the related meso zeaxanthin, it is selectively concentrated in the macula lutea of the retina, where these compounds form the macular pigment. This pigment absorbs blue light and quenches reactive oxygen species, which is thought to protect the retina. Humans cannot synthesize lutein, so body levels depend on diet, but it is not classed as an essential nutrient because no deficiency disease is recognized. Rich sources include dark green leafy vegetables such as kale and spinach, as well as corn, orange peppers and egg yolks, whose fat aids absorption. In the Age Related Eye Disease Study 2, lutein and zeaxanthin were evaluated as a replacement for beta carotene in a supplement formula for slowing age related macular degeneration, since beta carotene had been linked to lung cancer in smokers. Lutein also accumulates in brain tissue, and its links to cognition and visual performance are under study. It is also used as a food colorant.