is glutathione a amino acid L-Glutathione 500mg – Kal Vitamins

National consensus is that there are in severely deficient patients and those with malabsorption

We also encourage regular follow-up appointments to track your progress and address any questions or concerns you may have.

Still, if that's what you're getting, then I would suspect that as potentially the problem

56 It has also been reported that in fulminant hepatic failure, toxic substances released from the necrotic hepatic remnant and lack of detoxification of substances from the gut inhibit or delay liver regeneration and the recovery of hepatic function including aminotransferase production

(PubMed) Moreover, many regulatory agencies and dermatology bodies have expressed concern or even warned against the unregulated use of glutathione injections for cosmetic purposes, because of safety, contamination, dosing, and lack of evidence

It can also be artificially synthesized in a lab