when should i inject ghk cu GHK-Cu Dosage and Protocol: A Medical Provider's Guide to the 30-Day Cycle GHK-CU aka the beauty peptide.,
Description
All the data comes from one group, so people can be skeptical
However, they are widely accessible online through peptide suppliers under that disclaimer

GHK peptide injection is often considered when early signs of change appear or when other approaches have not provided the expected level of improvement

Yes, many studies use topical or ex vivo skin models to examine how the peptide behaves across tissue layers, separate from basic cell culture research
