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GHK-Cu (glycyl-L-histidyl-L-lysine copper) is a naturally occurring tripeptide just three amino acids bound to a copper ion

5 Journal of Orthopaedic ResearchChang CH et al

It's a synthetic fragment of the HGH molecule, specifically engineered to retain the fat-burning properties of full growth hormone without the metabolic side effects

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And other concurrent issues can mask progress: if your sleep is poor, your iron is low, your thyroid is off, or your testosterone is suboptimal, fixing B12 alone won't solve everything

That framing is why the question "is this a peptide?" is less useful than "does this signal the thing I want?" Peptides get most of the marketing because the word sounds scientific and clean