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Key pharmacokinetic parameters observed in animal models include: Plasma half-life approximately 20-30 minutes in rat models Rapid hepatic metabolism through aminopeptidase activity Complete clearance from circulation within approximately 10 minutes using sensitive detection methods in some studies Pharmacodynamic effects persist considerably longer than the plasma half-life would predict, suggesting either active metabolite contributions or persistent receptor-mediated signaling The dipeptide GP and tripeptide PGP, products of Selank biodegradation, are themselves reported to have independent biological activity, potentially contributing to the overall pharmacodynamic profile after parent peptide clearance

Santiago, T., Clay, M

Others maintain the full daily protocol for 3 to 6 months before taking a 4 to 8 week break

Copper peptides do not inhibit 5-alpha reductase and are unlikely to address the hormonal driver of androgenetic alopecia on their own