does ghk-cu lose effectiveness over time long-term use

does ghk-cu lose effectiveness over time long-term use for Anti-Aging: This Copper Peptide Really Work? Biological efficacy of GHK-Cu after

Name: does ghk-cu lose effectiveness over time long-term use for Anti-Aging: This Copper Peptide Really Work? Biological efficacy of GHK-Cu after
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Description

Pharmacokinetic Obstacles: The widespread clinical adoption of FOXO4-DRI is hindered by typical peptide-based limitations: rapid enzymatic degradation, low membrane permeability, and the requirement for injectable administration (PNAS, 2026)

I used it on my forehead and around my mouth

What exists is preclinical, and it is thin: Rodent and in-vitro work described procognitive and synaptogenic effects (McCoy 2013, PMID 23055539 now under an Expression of Concern