I am currently in the act of my own version of 'skin cycling'
I've had a good look online for which actives have the research to back them up (some of which I was aware of before) and then try and arrange everything so it gets a fair distribution, without irritating the crap out of my skin (last time I went for it my skin got slightly fried)
So far it seems to be working, I'm about 2 months in. I can do an acid exfoliation, Tret, copper peptides in the pm with an evening off, and alternate between copper peptides and Vit C/antioxidants during the day....then restart the process for the next 4 days
Also I'm trying out NIODs CAIS (copper peptides) and FECC (eye serum, peptides, matrixyl etc) since May. I've been using them as much as I can within my routine, without combining them when I exfoliate and use Tret, Vit C etc
I think I can see a difference around my eyes, I'm still not sure about the rest of my face, I have been using them on my neck and above the ole' boobs....I'm not sure whether it's only the CAIS (or a combi with the aha/Tret) but my decolletage does look better and my neck too, less crepey