Mechanisms of Disease: metabolic effects of growth hormone and insulin like growth factor 1 Nature Reviews Endocrinology The tripeptide GHKCu complex ameliorates lipopolysaccharideinduced acute lung injury in mice Oncotarget 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 Effects of GH IGF on the Aging Mitochondria 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