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However, copper peptides offer several distinct advantages: Tolerance: While retinoids often cause dryness, peeling, and irritation, especially during the initial adjustment period, copper peptides are generally well-tolerated even by sensitive skin types
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Irie et al

The peaks of 2-S-pyridinium derivatives of N-Hcy-Lys, Cys, Hcy, and GSH were monitored at 320 nm

Wilkins et al., 2003)
