So, macular degeneration is when, you could put it crudely, that the center of your retina that you're using for reading, degenerates, and you could say it's part of an aging process
and Srivastava A., 2nd Ed., Ch
Protection contre le stress oxydatif et les dommages cellulaires Le glutathion neutralise les espces ractives de l'oxygne gnres par les rayonnements UV, la pollution et le stress environnemental quotidien, contribuant ainsi protger les kratinocytes et les fibroblastes des lsions oxydatives
(PubMed) Shan Y, Zhang L, Bao Y, et al
the second is by inhibiting growth factor beta, thereby preventing hair follicles from prematurely shrinking
NAD can be either excreted in the urine or recycled as a substrate for sirtuins