How Often to Inject GHK Cu PeptidesExplorer 12 weeks in, and my skin has NEVER looked better! GHK peptides are doing their thing. Alright, I need to give you an updateit's been 12 weeks since I started using GHK GHK Cu Dosage and Protocol: A Medical Provider's Guide to the 30 Day Cycle Perfect B A peptide cycle length is how long you use a peptide before pausing or reassessing. , Too short and you wont see full results. Too long and your body adapts, making it less effective. , Every