Frontiers Growth hormone insulin like growth factor I axis in health and disease states: an update on the role of intra portal insulin The GH IGF 1 axis in ageing and longevity Nature Reviews Endocrinology 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 Regulation of insulin secretion by IGF 1 and GH. Notice the inverse Download Scientific Diagram