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Half-Life and Route GHRP-2 is a small peptide and, like most peptides, is not orally bioavailable in any efficient way because it is degraded in the gastrointestinal tract which is why parenteral (typically subcutaneous) administration dominates the research literature, and why intranasal delivery was explored in some early studies

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In preclinical and in vitro research, GHK-Cu has demonstrated a range of biological activities, including modulation of inflammatory cytokines and influence on cellular signalling pathways

This is where the comparison becomes important