copper peptide ghk cu randomized controlled trial skin (GHK-Cu): Clinical Uses, Stability & Compounding Tips Meet GHK-Cu — the tiny
Description
They are not compounded medical-grade peptides
If you add 4mL, the concentration is 2,500mcg/mL

If you freeze a multi-dose vial and thaw it multiple times, cumulative mechanical stress negates the preservation benefit

Yes, but fair skin requires longer loading (3 to 4 weeks instead of 1 to 2 weeks) and higher cumulative doses (20 to 50 mg instead of 5 to 10 mg)