Most peptide supplements marketed for muscle growth, anti-aging, or general wellness remain experimental and lack robust evidence for safety and effectiveness in humans.

While peptides like BPC-157 and CJC-1295 show promise in animal studies for tissue repair and healing, human trials are small or absent. The long-term effects, optimal dosing, and potential risks, including possible cancer cell activation, are not well understood. Experts urge caution, noting that many peptides sold online are unregulated and could pose health risks without medical supervision.