Plasma GDF15 increases during hyperinsulinemic hypoglycemia in humans with post bariatric hypoglycemia and after insulin exposure in mice: Cell Reports Medicine IGF 1 LR3 is a powerful growth factor that helps build muscle, burn fat, and speed up recovery. It works by boosting protein synthesis, which helps muscles grow and heal faster. It also improves how IGF 1 LR3 EQUINE MEDCARE A Medical Review of IGF 1 LR3 Dosage, Side Effects and Safety Aspects