Peptides for Muscle Growth
Last reviewed
Peptides are heavily marketed for building muscle and recovering faster. Here's what each one actually is, what the studies show in people, and what the anti-doping rules say.
The short version
- No peptide is FDA-approved for building muscle.
- The FDA has not authorized human growth hormone for bodybuilding or athletic enhancement, and distributing it for those uses violates federal law.
- Every peptide below is prohibited at all times for athletes tested under the World Anti-Doping Code.
- Human evidence for muscle gain is thin: a few small studies, mostly in older adults or using related compounds.
The peptides marketed for muscle, at a glance
| Peptide | What it is | FDA status | Sports (WADA 2026) |
|---|---|---|---|
| CJC-1295 | A growth-hormone-releasing hormone (GHRH) analogue | Not an FDA-approved drug | Prohibited, S2 |
| Ipamorelin | A growth hormone secretagogue (it prompts growth hormone release) | Not an FDA-approved drug | Prohibited, S2 |
| Sermorelin | The first 29 amino acids of GHRH | Used to diagnose and treat growth hormone deficiency in children; not approved for muscle building. Current status: sources disagree | Prohibited, S2 |
| Tesamorelin | A GHRH analogue | Approved only to reduce excess abdominal fat in adults with HIV-associated lipodystrophy | Prohibited, S2 |
| BPC-157 | Marketed for injury recovery | Not FDA-approved; awaiting FDA decision on compounding | Prohibited, S0 |
| TB-500 | A fragment of thymosin beta-4, marketed for recovery | Not FDA-approved; awaiting FDA decision on compounding | Prohibited, S2 |
Why growth hormone peptides are marketed for muscle
Most "muscle" peptides work by prompting the pituitary gland to release more of the body's own growth hormone. Growth hormone itself is a prescription drug for specific medical conditions. The FDA says it has not authorized growth hormone for anti-aging, bodybuilding or athletic enhancement, and federal law prohibits distributing it for uses other than treating a disease or recognized medical condition.
What the studies show in people
The best-designed human study we found used a close relative of sermorelin. In a 1997 placebo-controlled trial, 19 adults aged 55 to 71 injected a GHRH analog nightly for 16 weeks. Growth hormone and IGF-1 levels rose, and lean body mass increased in men but not in women, with no change in body weight. It's one small, short study in older adults, using a different molecule from the ones sold today.
For the recovery peptides, the evidence in people is thinner still. A 2025 systematic review of BPC-157 in sports medicine found only one human study, of 12 patients, and concluded that its safety in humans remains unknown. Details are on our BPC-157 and TB-500 evidence pages.
If you're a tested athlete
The 2026 World Anti-Doping Code Prohibited List names CJC-1295, sermorelin and tesamorelin as growth-hormone-releasing hormone analogues, ipamorelin as a growth hormone secretagogue, and TB-500 as a thymosin-beta-4 derivative, all in class S2. BPC-157 is listed in class S0, non-approved substances. Everything in both classes is prohibited at all times, in and out of competition. If you're tested, check any product with your anti-doping organization first.
The bottom line
Peptides sold for muscle growth aren't FDA-approved for it, the human evidence is limited, and they're banned in tested sport. For a medical concern like low growth hormone, a licensed clinician can test for it and discuss approved treatments. See also Are peptides safe?
Frequently asked questions
Are any peptides FDA-approved for muscle growth?
No. The FDA also says it hasn't authorized growth hormone for bodybuilding or athletic enhancement.
Are CJC-1295 and ipamorelin banned in sports?
Yes. Both are on the 2026 WADA Prohibited List in class S2, prohibited at all times.
Do growth hormone peptides build muscle?
The evidence is thin. In one 1997 study of 19 older adults, a GHRH analog increased lean body mass in men but not women.
Is BPC-157 good for injury recovery?
It's mostly been studied in animals. A 2025 review found one small human study and said its safety in people remains unknown. See BPC-157 benefits: what the research shows.
Sources
- The 2026 Prohibited List, World Anti-Doping Code (official Dutch government publication of the list)
- FDA Import Alert 66-71: Unapproved human growth hormone
- Khorram, Laughlin and Yen, GHRH analog in age-advanced men and women, Journal of Clinical Endocrinology and Metabolism (1997)
- Prakash and Goa, Sermorelin in children with growth hormone deficiency, BioDrugs (1999)
- Emerging use of BPC-157 in orthopaedic sports medicine: a systematic review, HSS Journal (2025)
- Egrifta SV prescribing information (Drugs.com)
- Drugs@FDA: FDA-approved drug products