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Other contraindications and caution flags include Wilsons disease or another copper-handling disorder, pregnancy, recent surgery, and WADA-tested competition

Based on our formulation team's experience and general dermatology guidance: use GHK-Cu in the morning, or as a recovery night treatment, and use retinol at night

Research shows it can boost collagen synthesis up to 70% depending on context and study conditions

Studies investigate its influence on sleep quality, cortisol regulation, and its unique ability to normalize sleep patterns without traditional sedative effects

This presents a fundamental challenge for oral peptide delivery