does ghk-cu develop tolerance How Much Should You Inject Daily? Doctor Explains Unlocking the Secrets of GHK-Cu:

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Areas of uncertainty in toxicity values generally include extrapolation from controlled high-dose animal studies to the human general population (including potentially sensitive subgroups) and generally lower exposure levels, determining if rodent endpoints are relevant to humans (e.g., tumors in the Zymbals gland of rodents), route-to-route extrapolation if toxicity values are lacking for certain exposure pathways, extrapolation from shorter-duration exposure studies to chronic or lifetime risk, and data gaps in the underlying toxicity database

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It could relate to how well your body is transporting oxygen

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