Is it necessary to cycle on and off of every peptide? The answer may not be as simple as you think, and it depends on *why* the peptide is being used., The standard logic for cyclingusing something Peptides for Longevity: BPC 157, TB 500, GHK Cu & CJC 1295 GHK Cu Purepep One of my favorite peptides is GHK Cu. It has made such a dramatic impact on my skin in just one cycle I've been shocked! It supports collagen, healing, and overall skin Cu Peptide Before and After: What to Expect for Skin and Hair