100 mg each per kg of body weight of both glycine and NAC daily for 14 days achieves a 94.6% RBC glutathione concentration
Dietary Glycine Is Rate-Limiting for Glutathione Synthesis and May Have Broad Potential for Health Protection - PMC
Glutathione is a key scavenging antioxidant that opposes the proinflammatory signaling of hydrogen peroxide. Boosting cellular glutathione levels may have broad utility in the prevention and treatment of disorders driven by oxidative stress. Supplemental ...
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5855430/
