5 Best Peptides For Muscle Growth Dr. Kris Conrad CJC 1295 Ipamorelin Dosage Protocol: The Complete Clinical Guide to Dosing, Cycling, and Injection Perfect B CJC 1295 Ipamorelin are growth hormone peptides that stimulate the pituitary gland to increase the release of growth hormone. The benefits include: decreased body fat, increased lean muscle mass, improved recovery When people ask about the best peptides for muscle building, most are starting in the wrong place. There's no peptide that directly builds muscle. At least not one I'm willing to use.