Vitamin C and Copper Peptides. The one or the other or both?

Hello everyone and thank you once again for letting me join this awesome platform. I have a question that I’ve been trying to research myself but with very little success, if any.

It boils down to this: what is the best way for me to keep my vitamin C serum and my Buffet + Cu copper peptides both on my skin? Sources vary too much. Any experience?