Dear Dr. Pickart,

I have been alternating 2nd generation of copper peptides with GHK serum for more than 1 years.

I know that Retinol can be used 2nd generation of copper peptides, how about GHK?

My plan is to use GHK serum in the evening and layer it with a cream of 2% Retinol.

GHK and retinol work well together. Start the method lightly since sometimes retinol can increase skin oils and lead to breakouts. But retinol is normally helpful.