A large proportion come from China, where imports of hormone and peptide compounds have increased dramatically: US customs data shows they hit $328m in the first three-quarters of 2025, up from $164m in the same period the previous year, the New York Times reported
If you have arrived here from a search like "what is the best copper peptide" or "best GHK-Cu copper peptide serum brands 2026," here is the direct answer before the nuance: for the majority of users, the best copper peptide is a stable 12% GHK-Cu serum formulated at a mildly acidic pH, packaged to protect the peptide from light and air, and kept relatively simple so the copper complex is not competing with aggressive actives
Use a gradual approach : Start with lower doses to assess how your body reacts
For instance, in oral pills, the retention is not extended, with little absorption
[DOI] [PubMed] [Google Scholar] 45.Singh S., Gupta G.D
These findings prompted researchers to conclude that epithalon may help increase the quality of life for elderly patients by improving sleep quality
