Dear Nat, Thanks for your comment. Some of readers have been able to google on Gamma Glutamyl cysteine / GGC supplements successfully. You may try a search on these key words.

Until recently it has been almost impossible to rapidly and reliably increase cellular glutathione with a drug or supplement. However, with the advent of gamma-glutamylcysteine and its ability to increase cellular glutathione we are hoping that researchers may be able to perform experiments perhaps on animal models to see if it can increase life span. What we can tell you is that there are many observational studies that show a strong correlation with three things:-
1. Cellular glutathione decreases as we get older [1, 2]
2. People suffering chronic diseases have lower cellular glutathione [3, 4]
3. Older populations of people that are relatively healthy and free of disease have higher cellular glutathione than their age matched peers [5]

1. Lenton, K.J., H. Therriault, A.M. Cantin, T. Fülöp, H. Payette, and J.R. Wagner, Direct correlation of glutathione and ascorbate and their dependence on age and season in human lymphocytes. The American Journal of Clinical Nutrition, 2000. 71(5): p. 1194-1200. http://www.ajcn.org/content/71/5/1194.abstract
2. van Lieshout, E. and W. Peters, Age and gender dependent levels of glutathione and glutathione S- transferases in human lymphocytes. Carcinogenesis, 1998. 19(10): p. 1873-1875. http://carcin.oupjournals.org/cgi/content/abstract/19/10/1873
3. Lang, C.A., B.J. Mills, W. Mastropaolo, and M.C. Liu, Blood glutathione decreases in chronic diseases. Journal of Laboratory & Clinical Medicine, 2000. 135(5): p. 402-5. http://www.ncbi.nlm.nih.gov/pubmed/10811055
4. Pérez, L.M., B. Hooshmand, F. Mangialasche, P. Mecocci, A.D. Smith, H. Refsum, M. Inzitari, L. Fratiglioni, D. Rizzuto, and A. Calderón-Larrañaga, Glutathione Serum Levels and Rate of Multimorbidity Development in Older Adults. The Journals of Gerontology: Series A, 2019 https://watermark.silverchair.com/glz101.pdf?token=AQECAHi208BE49Ooan9kkhW_Ercy7Dm3ZL_
5. Lang, C.A., B.J. Mills, H.L. Lang, M.C. Liu, W.M. Usui, J. Richie, Jr., W. Mastropaolo, and S.A. Murrell, High blood glutathione levels accompany excellent physical and mental health in women ages 60 to 103 years.[comment]. Journal of Laboratory & Clinical Medicine, 2002. 140(6): p. 413-7. https://pubmed.ncbi.nlm.nih.gov/12486409/

We understand that Gamma Glutamylcysteine (GGC) has been incorporated in dietary supplements.
A google search should be able to provide you with information you seek.

We understand that Gamma Glutamylcysteine (GGC) has been incorporated in dietary supplements.
A google search should be able to provide you with information you seek.