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People with active cancer or cancer history Pregnant or breastfeeding women Competitive athletes subject to anti-doping testing Individuals on blood thinners (consult physician first) People with Wilson's disease (avoid GHK-Cu specifically) Anyone unable to verify peptide purity from their source Frequently Asked Questions What is the best peptide for knee joint pain

A unique combination of three amino acids cysteine, glycine and glutamic acid

PMID: 25929832

By potentially acting at central regulatory junctions, it represents a peptide-based approach to investigating neuroendocrine synchronization mechanisms in controlled research environments