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GHK-Cu (sister peptide) delivered by repeated subcutaneous injection into rat wound chambers produced concentration-dependent increases in collagen, glycosaminoglycans, protein and DNA primary in-vivo evidence that the copper-tripeptide class is bioactive by injection in animals, but for GHK-Cu, not AHK-Cu

Can I buy them individually

It is an injection that comes in a pre-filled injection pen

Still, its use for other purposes, such as cosmetic skin whitening, is not typically FDA-approved and lacks substantial clinical evidence

Proper storage practices are discussed in greater detail in our guide to How to Store Research Peptides: Stability, Temperature & Shelf Life, which covers refrigeration, freezing, transportation, and long-term handling considerations for a wide range of research peptides