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That said, researchers may find it useful to have a bit of background on past GHK-Cu dosing protocols: Minimum Effective Dose The lowest known doses of GHK-Cu administered to test subjects involve the application of skin creams and topical ointments

PMID: 38182782

The functional groups present in the samples were identified by Fourier-transform infrared spectroscopy (FTIR) using a Nicolet iS20 spectrometer (Thermo Fisher Scientific, Waltham, MA, USA) in transmission mode with KBr pellet preparation

Since a 10mg vial at the starting dose provides four weeks of doses, you need the preservative to keep the solution safe across all four draws