There may be other brands with serums that contain copper peptides, but as far as I know Skin Biology is the only one I've ever seen talked about on this board. It's not available in stores, only through the Skin Biology website, but I thought it was well worth ordering. I personally only use the cp serum; I don't have the exfol serum. Maybe someone can verify this or correct me if I'm wrong, but I thought the way the two worked was that the cp serum helps break up damaged tissue and facilitate healing/rebuilding, and the exfol serum helps clear away the dead/damaged skin. I use the cp serum twice a day, morning and night, by putting about 5 drops on my fingertips and rubbing it in all over. Hope this answers some of your questions!