Dr. Pickart,

I have been lurking in the forum for a while and just made up my mind to try GHK serum & CP serum.

I saw your reply that it would be OK to apply CP serum on the skin after Retin A.

I would like to know if it is OK for me to apply CP serum first before Retin A.

The reason is that CP serum is quite thin and running and am afraid Retin A will be acting as a barrier to stop CP serum from penetarting into the skin.

Hi, I have just asked a similar question and sent an email directly to one of the staff. The reply I got was to apply the CP serum always first, then apply other creams/serum on top. Sandra, New Zealand.

Yes, that is a good method.

Many women use both retin-A and copper peptides with good results.