Competitive Sports Rules

Sport rules are separate from drug law

A peptide can be sold openly online with a "research use only" label and still end an athlete's season, because testers don't ask whether a product was legal to buy. They ask whether a banned substance turned up in the sample. For how countries regulate the sale and import of peptides, see our page on regional peptide regulations.

This page sets out the World Anti-Doping Agency (WADA) list that most testing programs start from, then shows where college sport and the pro leagues depart from it.

The WADA list is the baseline

WADA's 2026 Prohibited List has been in force since January 1, 2026. The 2027 List takes effect on January 1, 2027. Every signatory of the World Anti-Doping Code must apply it, including the Olympic movement. College and pro programs write their own lists, but most borrow WADA's categories and many of its named examples.

As of October 2026, this is where the peptides most often discussed on this site sit on the 2026 list:

Every prohibited class in the table applies in competition and out of it, so there is no off-season window.

S0 is a catch-all

S0 covers any pharmacological substance not addressed elsewhere on the list "with no current approval by any governmental regulatory health authority for human therapeutic use." Its examples include drugs still in development and substances approved only for veterinary use. BPC-157 is named outright, but an unnamed research peptide with no approval anywhere is caught by default. USADA's athlete advisory on the 2027 list says the 2027 S0 text now names "peptides" in general among its examples.

The same test makes approved peptide drugs harder to place. Bremelanotide (PT-141) is sold in the US as the prescription medicine Vyleesi, and in September 2025 the FDA granted accelerated approval to elamipretide (SS-31) as Forzinity for Barth syndrome. Neither is named on the list. Because both now have an approval, S0 no longer clearly applies to them, and we couldn't confirm whether another section does.

Specified doesn't mean minor

The list marks each class as Specified or non-Specified. S0 substances are Specified and S2 substances are non-Specified. Within S4, classes S4.1 and S4.2 are Specified while S4.3 and S4.4 (where MOTS-c sits) are not.

The list's own introduction, quoting the Code, says Specified substances "should not in any way be considered less important or less dangerous" than others. They are substances "more likely to have been consumed or used by an Athlete for a purpose other than the enhancement of sport performance," and the label matters when a sanction is worked out under Article 10 of the Code. So BPC-157 and TB-500 are both banned at all times, but a case involving each would start from different sanction rules.

Strict liability and exemptions

USADA's 2027 advisory states the core rule plainly: under the Code, "athletes are strictly liable, meaning they are ultimately responsible for what is in their systems."

Athletes with a legitimate medical reason can apply for a Therapeutic Use Exemption (TUE) under WADA's international standard for exemptions. In our reading, unapproved research peptides are a poor fit for that route, since there is no approved treatment to document.

How each type of competition applies the rules

Olympic and international sport

Olympic sport is where the WADA list applies most directly. Our page on IOC and Olympic peptide rules covers how Olympic athletes are tested and sanctioned and how exemptions work for them.

College sport (NCAA)

The NCAA writes its own list rather than adopting WADA's. For 2026-27 it bans eight drug classes, one of which covers peptide hormones and growth factors (plus related substances and mimetics). Its examples for that class include BPC-157 and TB-500 alongside growth hormone and ibutamoren (MK-677). The NCAA also says there is no complete list: any substance chemically or pharmacologically related to a banned class is banned too.

According to the NCAA's 2026-27 drug-testing manual, its year-round program generally tests for the peptide hormone class along with anabolic agents and a few other classes. The Division I consent form sets the penalty for a first positive for any non-narcotic banned drug at 365 consecutive days of ineligibility plus the loss of a season of competition. A second positive costs all remaining eligibility. Athletes who need a medication from the peptide hormone class must have a medical exception approved before they practice or compete. Our NCAA peptide regulations page covers testing and medical exceptions for college athletes.

Professional leagues

Pro leagues negotiate drug rules with their players' unions. Lists and penalties differ as a result. As of October 2026, the league documents we could open show the following.

• NFL. The 2026 Policy on Performance-Enhancing Substances has a "protein and peptide hormones" section, filed under anabolic agents, that names BPC-157 along with GHRH analogues such as CJC-1295 and ghrelin mimetics such as ipamorelin. A first positive for an anabolic agent brings a six-game unpaid suspension. The attached substance list was last updated on August 8, 2022.
• MLB. The 2022 Joint Drug Prevention and Treatment Program names TB-500 and ipamorelin among several growth hormone releasers. A first violation means an 80-game suspension and a second means 162 games; a third is permanent. We didn't find BPC-157 named in that text, and we didn't confirm whether a newer version has replaced it.
• NBA. Under the 2023 collective bargaining agreement, a first positive for a steroid or performance-enhancing drug brings a 25-game suspension, rising to 55 games for a second. A third means dismissal. The agreement also provides for random blood testing for growth hormone. We couldn't find a public copy of the NBA's current prohibited list, so which peptides it names is unverified.
• UFC. Since early 2024 the UFC's program has been administered by Combat Sports Anti-Doping (CSAD). Athletes face unannounced testing year-round, with every sample analyzed at one WADA-accredited lab. CSAD's 2026 results include a 12-month sanction for an ipamorelin positive that CSAD tied to a wellness-clinic product used during injury recovery. Another 2026 case, a 30-month sanction for testosterone, involved a fighter who admitted using BPC-157 as well.

Our page on professional league peptide policies goes through these leagues in more detail.

Natural bodybuilding

Drug-tested bodybuilding federations set their own banned lists and eligibility rules. Our page on natural bodybuilding federation rules covers how those federations treat peptides.

Labels and contamination

What a vial says on the outside has no bearing on a test result. The NCAA warns that supplements "may be contaminated with banned substances not listed on the label" and that athletes have lost eligibility this way.

In early 2026 CSAD issued a 9-month sanction for a mesterolone positive after finding no intentional use, with the evidence pointing to contaminated supplements from a compounding pharmacy. A 2024 sample with a low-level LGD-4033 metabolite, traced to a contaminated supplement, led to a 180-day sanction. In both cases the athlete was still sanctioned.

What we still don't know

• Whether WADA treats bremelanotide (PT-141) or elamipretide (SS-31) as prohibited under any section now that both are approved drugs.
• The exact wording of the 2027 S0 definition. This page relies on USADA's summary rather than WADA's own 2027 text.
• What the NBA's current prohibited list names, and whether MLB's 2022 program text is still current. We didn't review the NHL or other leagues.
• Whether GLP-1 drugs stay off the list. Semaglutide and tirzepatide remain in WADA's 2027 Monitoring Program, according to USADA. That means labs track them but athletes aren't sanctioned for them.