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This comparison breaks down exactly how they differ and where each one has the strongest research support
For instance, when intra-portal insulin levels are increased [e.g., obesity, Cushings syndrome or due to treatment with glucocorticoids and glucagon-like peptide-1 receptor agonists (GLP-1RA)] or decreased (e.g., anorexia nervosa and T1D) in disease states, these secondary changes (secondary association) alters hepatic GH sensitivity resulting in discordant GH and IGF-I levels (high GH/low IGF-I levels and low GH/high IGF-I levels, respectively)
GHK-Cu dosage spans two distinct administration routes in the research literature injectable systemic protocols and topical application protocols each with its own dosing conventions, concentration ranges, and timing considerations
Neurobiol Aging
Reference: Sikiric et al., 2010 Nitric oxide system involvement in BPC 157 effects PubMed: 2