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Because this protocol includes GHK-Cu (a copper peptide), avoid use if you have a known copper/copper-peptide allergy

Because it works upstream, your body's natural feedback systems stay active

Please note that it is difficult to administer higher dosages of vitamin C through injection alone

Researchers often study the combination because both peptides stimulate growth hormone release through complementary mechanisms, making them valuable together in GH-related research protocols

Nature 517 , 219222 (2015)