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Recent studies demonstrate that gut microbiota modulate dietary tryptophan metabolism, producing bioactive metabolites such as indole derivatives, kynurenines, and serotonin that influence neurophysiology, mood, cognition, and the gutbrain axis (Yuxuan et al., 2026

Because it delivers the fully formed, intact glutathione molecule directly to the cells, it does not require the body to synthesize it from precursors, and it does not trigger the histamine-liberating effects associated with NAC

Following bacterial or viral infections, increased expression of self-antigens may occur, causing abnormal MHC expression and disrupting immune tolerance (Pu And Zhang 2024)

In particular, we suggest studies evaluating stronger PDEis such as sildenafil or vardenafil in combination with L-arginine