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Oral administration, if viable (which for most peptides, it's not due to gastric degradation), would likely lead to an even shorter effective half-life due to first-pass metabolism

Early animal and small human studies suggest it is generally well tolerated in the short term, but we do not yet have large, longterm trials

Physical enhancement methods including iontophoresis, microneedling, and ultrasound also significantly increase GHK-Cu delivery, with microneedling pre-treatment increasing peptide penetration by approximately 10-fold compared to intact skin application, effects similar to those achieved with other topical peptide formulations optimized for transdermal delivery

The status of IRS-1 determines which of the above two signals of IGF-1 predominates in cultured CD34 + cells