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Why Storage Rules Exist: The Chemistry Behind Stability Peptide degradation in solution occurs through three primary chemical pathways: hydrolysis (water cleaves the peptide backbone, most rapid at elevated temperature and acidic or alkaline pH), oxidation (methionine, cysteine, and tryptophan side chains react with dissolved oxygen or photocatalytic radicals), and deamidation (asparagine and glutamine residues lose an amide group, producing aspartate or glutamate and altering the peptide's charge and receptor binding)

Endocrinology, 2016

This amount reduces over time

However, certain conditions like pregnancy may result in increased excretion of L-carnitine, potentially increasing the risk for deficiency

A reason for this behaviour could be that H 2 O 2 does not oxidize GSH directly, but rather through the action of glutathione peroxidase 26