GHK-Cu peptide dosage Chart The injectable GHK-Cu suggested dosage is 0.2 mL delivered subcutaneously. This is meant to be given once per day. Inject 10 units daily subcutaneously. Following this dosing example, the vial will last about 20 injections or about 3 weeks. In plasma, the level of GHK-CU is about 200 ng/ml at age 20. By the age of 60, the level drops to 80 ng/ml.
