Serious adverse effects are uncommon but possible, including allergic reactions, severe injection site reactions if improper technique is used, and excessive detoxification responses in susceptible individuals
Taking glutathione on an empty stomach, or at least 30 minutes before a meal, may support faster absorption
This is why these things go to the gray market or black market
J Biochem Mol Toxicol 32(2):e22019 [DOI] [PubMed] [Google Scholar] Taslimi P, Kandemir FM, Demir Y, leritrk M, Temel Y, Calayan C, Glin (2019) The antidiabetic and anticholinergic effects of chrysin on cyclophosphamide-induced multiple organs toxicity in rats: pharmacological evaluation of some metabolic enzymes activities
Headaches are an uncommon but reported mild side effect in a small subset of users, particularly when starting supplementation or at higher doses