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It is important to note that peptides often demonstrate pleiotropic effects, influencing multiple physiologic pathways beyond their target tissue

A scoping review on mycotoxin-induced neurotoxicity

Since these two amino acids are interconverted through a single enzymatic reaction catalyzed by serine hydroxymethyltransferase 16 , increased serine levels may cause elevated glycine levels and vice versa

To defend this claim, they often point to the same two studies: In a study of guinea pigs (which, like humans, cannot make their own vitamin C), glutathione ester supplementation completely prevented scurvy from vitamin C deficient diets