The Ultimate Weight Loss Peptide Blend: SLU PP 332, 5 Amino 1MQ, and B Revolution Health & Wellness Have you used peptides? What are your thoughts? Let me know below Peptides are short chains of amino acids that play vital roles in cellular signaling and repair throughout the body. Columbia Undergraduate Science Journal 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.