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Description
People mostly use this peptide for its healing and recovery potential, not muscle growth
More important than concentration is the formulation's pH stability (GHK-Cu is stable between pH 5.0 and 6.5) and the carrier's ability to deliver the peptide past the skin barrier

Nose-to-brain delivery of paliperidone palmitate poloxamer-guar gum nanogel: Formulation, optimization and pharmacological studies in rats

Retinol at a different time of day is fine
