ghk-cu injectable clinical trial safety Why is GHK delivery challenging?

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Please note: For intramuscular use only

Hong S, Moreno-Navarrete JM, Wei X, Kikukawa Y, Tzameli I, Prasad D, Lee Y, Asara JM, Fernandez-Real JM, Maratos-Flier E, Pissios P. Nicotinamide N-methyltransferase regulates hepatic nutrient metabolism through Sirt1 protein stabilization. Nat Med. 2015 Aug;21(8):887-94. doi: 10.1038/nm.3882. Epub 2015 Jul 13. PMID: 26168293; PMCID: PMC4529375

BPC-157 Protocols: The Essential Handbook for Regeneration and Health: BPC157 Peptides

Carcinogenesis, Mutagenesis, Impairment of Fertility

This is different from oral vitamin supplements, which are taken by mouth and must be digested and absorbed through the digestive system.