does ghk cu lose effectiveness over time tolerance desensitization The Effect of the Human Peptide on Gene Expression Relevant to Nervous System Function and Cognitive Decline GHK-CU Making Skin Worse: Complete
Description
While earlier studies suggested that -arrestin-2 recruitment mediates respiratory depression (Raehal et al., 2005), this hypothesis has been challenged by recent work demonstrating comparable respiratory depression in -arrestin-2 knockout mice (Kliewer et al., 2020

Efficacy threshold
10.1046/j.1365-4362.1999.00832.x 16 BraddockM

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