Sublingual GHK Cu TruHealth Physical Therapy Peptides, like Bio Identical Hormones, are not a magic bullet but they are pretty darn close. Over the years, we have seen them effectively heal chronic wounds, reduce joint paint and 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