There's no established "ideal" percentage yet but 1-2% is the evidence-backed range
This was due to the fact that the system contained a large amount of silver nanoparticles, and the adsorption of glutathione onto the surface of AgNPs led to the agglomeration of silver nanoparticles and the reduction of their particle spacing, which increased the intensity of the IR absorption peak
Pharmacol Res - Rep 3:100043 Elhady SS, Abdelhameed RFA, Mehanna ET, Wahba AS, Elfaky MA, Koshak AE et al (2022) Metabolic Profiling, Chemical Composition, Antioxidant Capacity, and In Vivo Hepato- and Nephroprotective Effects of Sonchus cornutus in Mice Exposed to Cisplatin
Most common side effects of glutathione According to Jack Jeng, M.D., the most common side effects of glutathione are Abdominal cramping Increased flatulence Loose stools Other side effects depend on how you take glutathione
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While it doesn't directly engage in the antioxidant activity of glutathione, glycine contributes to the molecule's overall structure and stability, enabling its biological function