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In a four-peptide blend the risk is amplified: each additional ingredient is another opportunity for an impurity, an endotoxin, or a synthesis error, and copper-containing products add their own stability and dosing considerations

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Learning to catch counterfeit imported supplements before purchase rather than after protects your health too, since some fakes carry unregulated compounds, incorrect stimulant doses, or contaminants that can trigger digestive trouble, cardiovascular stress, or worse over sustained use

Food Science and Biotechnology, 27 , 13691376

Since glutathione is a tripeptide (a small protein), your stomach often breaks it down into its individual amino acids before it ever reaches your cells