does ghk-cu build tolerance or lose effectiveness over time Unlocking the Secrets of GHK-Cu: The Revolutionary Peptide for Youthfu Peptide Therapy for Hair Growth:
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Baxter RC
Rasool et al., 2022
Gojkovic, S., Krezic, I., Vranes, H., Zizek, H., Drmic, D., Vuletic, L
For example, the R36Q and V44M mutations result in a bioinactive IGF-I where the patient produces IGF-I, but the IGF-I is incapable of binding with or has very low affinity for the IGF-I receptor, and therefore is relatively bioinactive
