Growth Peptides for Bodybuilding: Expert Insights & Protocols R2 Medical Clinic Peptide side effects no one talks about BPC 157 headaches. TB 500 fatigue. CJC Ipamorelin water retention. Most people quit. But 90% of the time it's the protocol, not the peptide. Ipamorelin Wikipedia Some peptides focus on fat loss. Some focus on recovery. Ipamorelin is interesting because researchers study it for both. Why? Because it stimulates natural growth hormone pulses without strongly affecting other hormones.