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Disulfide bonds are covalent bonds between the sulfur atoms on cysteine side chains, such as in oxidized glutathione (Figure 4)
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The cysteine in whey protein is largely present as glutamylcystine, which is resistant to digestive degradation and serves as an efficient substrate for glutathione synthesis [22]
GHK-Cu peptide does not have an FDA-approved prescribing label establishing it as a drug for a labeled medical indication in the sources reviewed
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