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While consuming a diet rich in Glutathione or taking supplements can increase the levels of Glutathione in the body, the efficacy of this antioxidant diminishes as it passes through the digestive system
References Irvine DS
Purity Level (99% vs 70%) High-purity L-Glutathione (Japan or USA certified) costs more because it delivers better skin-brightening results and is medically safer
The lysine side chain provides additional binding interactions that contribute to receptor specificity
V., Dolgintsev, M
doi:10.1016/j.ymben.2003.09.001
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