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Wei J, Mou C, Bao Y, Xie Y, Jin H, Shen H, Zhou W, Zhang J, He S, Chen B, Liu L
doi: 10.1038/nature13858
Ensuring your body has enough cysteine helps maintain optimal glutathione levels
These findings suggest that intercellular glutathione exchange occurs between lymphocytes and dendritic cells or fibroblasts and plays an important role under oxidative stress conditions, as seen in TLS

So you might be better off getting it from natural sources
D., Fulgenzi A., and Ferrero M
