Thus, the enzyme cannot be inhibited by more than 100% and the actions of the incretin hormones are glucose-dependent ( Despite the theoretical potential for multiple endogenous DPP-4 substrates to be affected and for the DPP-4 protein to have diverse actions, as discussed in the sections above, pooled safety analyses (119123), and large cardiovascular (CV) safety outcome trials (124127) with the individual drugs, which between them have included many thousands of patients (Table 2), have uniformly shown that DPP-4 inhibitors are well-tolerated and not generally associated with adverse effects
Several of the clinical trials showing a skin-brightening effect included vitamin C alongside glutathione rather than testing glutathione entirely alone
Tillner J, Golor G, Voirot P, Lehmann A, Frosio C, Megard C, Lorenz M
Youll want to make sure you use a great moisturizer though, since the salicylic acid can dry out your face