ghk-cu subq injection sites subcutaneous Administering Drugs via a SUBCUTANEOUS INJECTIONS – GHK-Cu (Copper Peptide) Deep Dive:

The adjustment phase, sometimes called "retinization," typically involves two to six weeks of dryness, flaking, and redness as skin adapts to accelerated turnover

Abandoning too early means missing potential benefits

4.5 Pharmacokinetic, tissue distribution, and excretion studies in rats administered radioactive-labeled BPC157 Thirty intact SD rats, six JVC rats, and six BDC rats (half male and half female subjects) were injected intramuscularly with 100 g/300 Ci/kg of [3H]BPC157

[6] [7] The corneal branch is notable only because it is the one that actually reached human trials and it did so as a defined topical formulation of the full protein, not as a systemic fragment