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Focus on peptide concentration (typically 3%-8% for serums), verified through third-party Certificates of Analysis (CoA)

The systemic availability of oral glutathione

Attributing the result to GHK-Cu alone isn't science, it's wishful accounting

Pro Glutathion therefore supplies cysteine in a stabilized form as N-acetylcysteine (chemically correct N-acetyl-L-cysteine, also known as NAC)

This attention to quality control ensures researchers can maintain consistent experimental conditions and get reproducible results across multiple studies

The cytoprotection concept after Robert and Szabo is extended systemically via modulation of the NO system Sikiric et al., 2025