Glutathione is generally considered safe for most skin types when taken in appropriate doses
So patients experience results that are evident within the first few days, if not hours
J Physiol Paris 93:479485 Sikiric P, Seiwerth S, Brcic L, Blagaic AB, Zoricic I, Sever M, Klicek R, Radic B, Keller N, Sipos K et al (2006) Stable gastric pentadecapeptide BPC 157 in trials for inflammatory bowel disease (PL-10, PLD-116, PL 14736, Pliva, Croatia)
Find out if you should be concerned in our article: Is it safe to drink coffee regularly
NIH, National Library of Medicine, PubMed - Glutathione and its antiaging and antimelanogenic effects 5