Role of the GH IGF1 axis on the hypothalamuspituitarytesticular axis function: lessons from Laron syndrome in: Endocrine Connections Volume 10 Issue 9 (2021) A Medical Review of IGF 1 LR3 Dosage, Side Effects and Safety Aspects What is IGF 1 LR3? Insulin Like Growth Factor 1 Long R3 (IGF 1 LR3) is a modified version of IGF 1 with a longer half life, making it significantly more potent and effective for muscle growth, IGF Penis Enlargement: What the Evidence Actually Shows About IGF 1 and Penile Growth IGF 1 LR3: Dosage Results and Safety Guide Vita Bella Health 40 YEARS OF IGF1: Insulin like growth factors: actions on the skeleton in: Journal of Molecular Endocrinology Volume 61 Issue 1 (2018)