This isnt a universal step
This guide walks through what glutathione actually does to skin pigmentation, what the clinical studies found (and didn't), which format carries which risk, and what an Indian dermatology journal specifically recommends before you consider an injection
Each bottle contains 60 capsules
doi:10.1155/2012/190930, PMID: 22934169 Kang PT, Zhang L, Chen CL, Chen J, Green KB, Chen YR (2012) Protein thiyl radical mediates S -glutathionylation of complex I
This longevity of research interest is itself informative: compounds that fail to replicate across independent laboratories typically disappear from the literature within a decade
Frias JP, Deenadayalan S, Erichsen L, et al