This [[xanthophyll]], like its sister compound [[zeaxanthin]], has primarily been used as a natural colorant due to its [[orange-red]] [[color]]. Lutein absorbs [[blue]] light and therefore appears [[yellow]] at low concentrations and orange-red at high concentrations. Lutein is also anti angiogenic. It inhibits VEGF.
Lutein was traditionally used in [[chicken]] feed to improve the color of [[broiler]] chicken skin. Polled consumers viewed yellow chicken skin more favorably than white chicken skin. Such lutein fortification also results in a darker yellow [[egg yolk]]. Today the coloring of the egg yolk has become the primary reason for feed fortification. Lutein is not used as a [[colorant]] in other foods due to its limited stability, especially in the presence of other dyes.
==Función no ollo humano==