ghk-cu clinicaltrials.gov Copper Peptide: Benefits, Dosage & How It Works (2026) How GHK-Cu Tightens Loose Skin:

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2014 (PMID 25187433), which tied the procognitive effect to HGF/c-Met dependence, was retracted in 2025 (retraction notice PMID 40312093)

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The propensity score was constructed from age at the index date (continuous), sex, race, region, number of RMS relapses in the preindex period (0, 1, 2+), prior DMT in the preindex period, RMS disability in the preindex period, Deyo-Charlson comorbidity index (DCCI) in the preindex period (continuous), and Psychiatric Diagnosis Group index in the preindex period (continuous)