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Experts emphasize that: These are medical compounds, not cosmetic ingredients Peptide skincare is a separate scientific field Confusion arises from online misinformation A professional peptide serum clinic will always separate cosmetic peptides from pharmaceutical research compounds

Cysteine, one of the three building blocks of glutathione, is most concentrated in eggs, meat, and dairy

Disparate results are likely due to study design issues, often linked to a lack of understanding of vitamin C pharmacokinetics and requirements (19, 20)

Ask for Certificates of Analysis that say the HPLC is at least 98% pure, the peptide content is at least 80%, and there are thorough impurity profiles

Holmes, R