Frontiers Short stature related to Growth Hormone Insensitivity (GHI) in childhood Before vs. after 3 months of GHK Cu peptide therapy smoother texture, more even tone, and skin that looks healthier overall. Small peptide, big difference Copper peptide GHK Cu Wikipedia Figure 1 from Intranasal Human Growth Hormone (hGH) Induces IGF 1 Levels Comparable With Subcutaneous Injection With Lower Systemic Exposure to hGH in Healthy Volunteers Semantic Scholar