Safety and Side Effects There are currently no large scale human trials on MOTS c for wellness or fertility
Only one company (from Australia) sells it and they spent 20 years trying to synthesize GGC at reasonable cost and finally gave up and ended up extracting the rate limiting enzyme from freshly slaughtered beef kidney and reacting it with gluthathione + Cysteine : It is why their manufacturing plant is located in a Texas slaughterhouse district
PubMed Central , Food & Function , vol
Glutathione metabolism and its implications for health. J Nutr
104,105 However, ROS can also originate from other sources, such as NADPH oxidase (Nox), monoamine oxidase (MAO), p66Shc, -glycerophosphate dehydrogenase, electron transfer flavoprotein (ETF) and ETF dehydrogenase, and aconitase
Bioactive whey protein powder extracted from milk is by far the best, most bioavailable source of the most important, rate-limiting glutathione precursor, cystine (It also conveniently contains the two other amino acid precursors glycine and glutamine)