IGF 1 LR3 The Muscle Building Peptide Everyone's Talking About IGF 1 LR3 is one of the most powerful performance peptides used for muscle growth, recovery, and fat loss. It's a modified version How HGH Works: Boosting IGF 1 for Muscle Growth Yizhe Wang posted on the topic LinkedIn WHAT TAKING IFG 1 DID TO ME I am injecting IGF 1 LR3 to myself. I have experienced some side effects that I want to reduce to zero. If you have injected IGF 1 or have any other experience with intramuscular HGH vs IGF 1 LR3: Scientific Comparison & Research Guide