bpc-157 upregulates growth hormone receptors Multifunctionality and Possible Medical Application of the BPC 157 Peptide—Literature and Patent Review Nature Reviews Methods Primers: Peptides

Human risk is unknown Important limits Animal studies cannot establish safe liver effects or monitoring rules for people

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Not having enough can cause serious nerve problems

GHK-Cu has a broader base of independent research, including several small human clinical studies in dermatological applications and commercially available topical formulations