Lutein

Lutein (CAS No.: 127-40-2) is a naturally occurring xanthophyll carotenoid synthesized exclusively by plants and abundantly present in green leafy vegetables, where it functions in photoprotection by modulating excess light energy and quenching reactive excited chlorophyll species during photosynthesis. In biomedical research, lutein is classified as a bioactive dietary carotenoid with prominent antioxidant and anti-inflammatory properties, primarily mediated through modulation of reactive oxygen species and associated signaling cascades, including pathways linked to oxidative stress responses, apoptosis regulation, and inflammatory mediator production. It has been widely investigated for its protective effects in ocular systems, as well as for emerging roles in neuroprotection, where it is capable of crossing the blood–brain barrier and influencing neuronal survival and function. In vitro studies typically demonstrate activity in the low micromolar range, reflecting its capacity to attenuate oxidative damage and inflammatory signaling in various cell-based models. Lutein is commonly utilized in cellular and animal models to study mechanisms of retinal degeneration, neuroinflammation, and oxidative stress-related disorders, with experimental concentrations or dosing regimens varying according to specific study designs and therapeutic hypotheses.