A couple of good examples are collagen, with an oral bioavailability as high as 63%,7 and GHK-Cu (copper peptides), which can pass through the skin in therapeutically effective amounts, per a 2010 study.8 Preparation and storage of injectable peptides An injectable peptide normally comes in powder form
Han YH, Kim SH, Kim SZ, Park WH
Am J Physiol Endocrinol Metab 2004;287:E12 0915
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