Carotenoid pigment replenishment in retina

Carotenoid pigment replenishment in the retina refers to the uptake, transport, binding, and metabolism of dietary carotenoids—primarily lutein, zeaxanthin, and meso-zeaxanthin—within retinal tissues[2][3][4]. These carotenoids act as **antioxidants** and **blue light filters**, protecting the macula and photoreceptors from oxidative damage caused by high-energy visible light and reactive oxygen species. Because humans cannot synthesize these carotenoids, their retinal levels depend on dietary intake and the function of specific transporters (such as GRAMD1B), enzymes (BCO2), and binding proteins (GSTP1, StARD3)[1][2]. Deficiencies or impaired replenishment increase the risk of diseases such as **age-related macular degeneration** and cataract[3][4]. Supplementation with lutein and zeaxanthin is widely used to increase macular pigment density, thereby supporting retinal health and reducing disease risk[4].

Other names

Macular carotenoid transportCarotenoid homeostasis in retinaMacular pigment turnoverLutein/zeaxanthin replenishment

Increase macular pigment density by supplying exogenous carotenoids Antioxidant action to counteract reactive oxygen species (ROS) Blue light filtering