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 GHK Cu Copper Peptide Regeneration, Skin Renewal & Anti Age Full honest & unfiltered experience with GHK Cu 1 month after completing a 12 week cycle: Weeks 12: No noticeable changes. Weeks 34: Skin rash (rib area) worsened. Weeks 56: Extreme dryness, flaking, GHK: A comprehensive researcher's handbook Tydes Copper Peptide Skincare Routine: How to Layer Peptides Glimmer Goddess