It's quickly broken up by an enzyme called DPP-4 and then flushed out by the kidneys
[DOI] [PMC free article] [PubMed] [Google Scholar] 105.Guan W.-J., Ni Z.-Y., Hu Y., Liang W.-H., Ou C.-Q., He J.-X., Liu L., Shan H., Lei C.-L., Hui D.S.C., et al
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Redox Biol 29:101378
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Lipofuscin is a byproduct of RPE cells engulfing the outer segment of photoreceptor cells, and its main fluorescent group is N-vinylidene retinyl-N-vinylethanolamine (A2E)