IGF 1 LR3 Injection Benefits And How It Works The HCG Institute 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, Best time to take growth hormone? , Most athletes use it on an empty stomach, with the most common timing about an hour before bed., Consistency and timing make the difference., Watch the full IGF 1 LR3 and Penis Enlargement: What the Evidence Shows for Adult Men