Peptides in Sport: Athletic Risks, Doping & Health Hazards

Athletes and bodybuilders typically explore peptides across three physiological domains:

• Growth Hormone Secretagogues (GHRH/GHSR ligands): CJC-1295, ipamorelin, and MK-677, used to elevate endogenous GH and IGF-1 for lipolysis and nitrogen retention.
• Tissue Repair Compounds: BPC-157 and TB-500, used in attempts to accelerate recovery from ligament sprains, tendon tears, and muscle strain.
• Metabolic & Fat Loss Agents: Incretin mimetics (GLP-1 RAs) and mitochondrial peptides (MOTS-c), used for rapid body mass reduction and weight-class cutting.

While promoted online as 'side-effect-free alternatives to anabolic steroids,' peptides introduce distinct physiological vulnerabilities:

• Cardiomegaly and Left Ventricular Remodeling: Sustained elevation of circulating GH and IGF-1 induces cardiac myocyte hypertrophy, diastolic dysfunction, and elevated lifetime risks of cardiac arrhythmias.
• Insulin Desensitization: Growth hormone is an antagonistic counter-regulatory hormone to insulin. Chronic secretagogue use induces peripheral insulin resistance, compensatory hyperinsulinemia, and beta-cell exhaustion.
• Tendon-Muscle Remodeling Mismatch: Rapid increases in contractile muscle force without adequate time for tenocyte collagen cross-linking dramatically increases the incidence of catastrophic tendon avulsions (e.g., biceps or patellar tendon tears).
• Unregulated Angiogenesis: Compounds promoting VEGF transcription can accelerate microvascular proliferation in unrecognized occult dysplastic lesions.

Under the World Anti-Doping Code, the principle of Strict Liability applies: an anti-doping rule violation occurs whenever a prohibited substance is found in an athlete’s sample, regardless of intent, negligence, or whether the substance was mislabeled as a research chemical or dietary supplement. Athletes testing positive face mandatory 2- to 4-year bans and public disqualification.