Reference only. This page covers what the compound is, how it is presented and how it is handled. It does not give dosing protocols or administration schedules, and it is not medical advice.
Every pen carries a batch identifier printed on the unit itself. That identifier ties the pen in your hand to an independent HPLC assay of the batch it came from.
This matters more than a headline purity figure. A percentage quoted without a batch reference describes some material the seller once tested, not necessarily the material you received. A figure that can be matched to the identifier on your own pen describes yours.
What the assay covers
Identity and purity by high performance liquid chromatography. For GHK-Cu the copper content forms part of the assay, since the uncomplexed peptide is a different molecule.