Peptides are short chains of amino acids that serve as building blocks for proteins and play vital roles in biological processes. They are widely used in medicine, fitness, and anti-aging treatments due to their ability to stimulate specific cellular functions. In bodybuilding, peptides are popular for promoting muscle growth, fat loss, and recovery by mimicking the effects of natural hormones such as growth hormone-releasing peptides (GHRPs) and growth hormone secretagogues (GHSs).

Common peptides include Ipamorelin and CJC-1295, which boost growth hormone levels, and BPC-157, known for enhancing tissue repair and reducing inflammation. Other peptides like Melanotan are used for skin tanning, while TB-500 promotes wound healing. Although peptides offer targeted benefits, misuse can lead to side effects such as water retention, joint pain, or hormonal imbalances. Proper dosing, cycling, and medical supervision are essential to ensure safe and effective use of peptides for performance enhancement or therapeutic purposes.