Is MOTS-c Banned in Sports? WADA S4.4.1 Status, Drug Tests and TUEs

The Prohibited List is published every year and comes into force on 1 January. Section S4 covers hormone and metabolic modulators. Under S4.4.1, activators of AMP-activated protein kinase are prohibited at all times, and the named examples are BAM15, AICAR and "mitochondrial open reading frame of the 12S rRNA-c (MOTS-c)." S4.4.2 covers insulins and insulin-mimetics, and S4.4.3 and S4.4.4 cover meldonium and trimetazidine.

MOTS-c is named in the List itself, not merely caught by a catch-all. Older pages that describe it as unnamed are out of date. The 2027 Prohibited List, already published, carries MOTS-c forward in S4.4.1 unchanged.

Why an AMPK activator is on the List at all

MOTS-c is a 16-amino-acid peptide encoded in mitochondrial DNA. It was described in Cell Metabolism in 2015 and Nature Communications in 2021, in mice, as an exercise-induced regulator of metabolism and physical decline, and it is described as activating AMPK in muscle. The List places AMPK activators among the metabolic modulators of S4.4, which is where MOTS-c sits. Being on the List is a rule about the mechanism, not proof that MOTS-c improves performance in people: there are no randomised controlled trials of MOTS-c in humans. The research picture is in MOTS-c benefits.

The blends that contain MOTS-c

A blend is prohibited by virtue of its components. Several Pepti blends contain MOTS-c, and some contain a second prohibited substance as well.

Prices are all-in monthly figures covering medication, physician review, refill management and shipping, with no membership fee. Compounded medications are not FDA approved.

Classes S0 to S5 are prohibited in and out of competition. There is no off-season window for an S4 substance, and out-of-competition testing exists to catch substances used during training blocks. A course of MOTS-c taken months before an event is the same violation as one taken the week of it.

Anti-doping rules decide what is permitted in competition. They do not care whether something is legal or prescribed. MOTS-c is legal to prescribe and dispense in the United States with a valid prescription, and it is still prohibited for a tested athlete.

Article 2.1.1 of the World Anti-Doping Code makes it each athlete's personal duty to ensure that no prohibited substance enters their body, and says intent, fault, negligence or knowing use need not be shown to establish a violation. That is strict liability. Fault is weighed only at the consequences stage.

The TUE route is effectively closed

A therapeutic use exemption is the formal route by which a tested athlete may use a prohibited substance for a genuine medical need. It requires a diagnosed condition supported by clinical evidence, no performance enhancement beyond a return to normal health, no reasonable permitted alternative, and a need that did not arise from earlier prohibited use. For MOTS-c, USADA has gone further and stated that it is not eligible for a TUE. If you compete, treat MOTS-c and every blend containing it as unavailable to you.

The NCAA bans eight drug classes, including "hormone and metabolic modulators" and "peptide hormones, growth factors, related substances and mimetics." It states that any substance chemically or pharmacologically related to a banned class is also banned even if it is not listed as an example, and that the school and the student-athlete are both accountable. A college athlete should not assume MOTS-c is permitted because it does not appear in the NCAA's printed examples. Professional leagues, military services and some employers run their own policies; read the current one that applies to you.

Detection windows for small peptides are generally short, but that is not a strategy. Under Code Article 6.6 a sample reported negative can be stored and reanalysed, and Article 17 allows a charge within ten years. MOTS-c also occurs naturally in the body; the human data that exists is observational, measuring the body's own MOTS-c, which rises with exercise. How a laboratory distinguishes a dose from the body's own level is a question for the testing authority, and nothing about natural occurrence creates a permission. The wider picture is in do peptides show up on a drug test.

A separate question with a separate answer. MOTS-c was placed in Category 2 of the FDA's interim 503A bulk drug substances list in 2023. On 15 April 2026 the FDA removed it from Category 2, one of twelve peptides removed after their original nominations were withdrawn. On 23 July 2026 the FDA's Pharmacy Compounding Advisory Committee voted 7 to 5, with two abstentions, to recommend adding MOTS-c to the 503A Bulks List, against the recommendation of FDA's own reviewers, who cited the absence of human clinical data. The FDA's final determination is pending.

MOTS-c remains legal to prescribe and dispense, and it is not FDA approved; compounded medications never are. None of this affects its anti-doping status. A compounding decision is not a drug approval, and WADA lists MOTS-c by mechanism. More is in what is MOTS-c and MOTS-c side effects.

Check every medication on Global DRO, the database USADA directs athletes to, and keep the reference number. A physician may still discuss options that are not on the List, each checked against your federation's adopted version; the athlete overview is in peptides for athletes.

MOTS-c cannot be bought legitimately without a prescription. Sites selling it "for research use only" are not accountable for what is in the vial: identity, purity, sterility and concentration are untested. The prescription route:

1. Complete a free online intake covering your history, medications and what you want help with. If you are subject to anti-doping testing, say so there.
2. A physician licensed in your state reviews it, usually within 24 hours.
3. If it is appropriate, a state-licensed, FDA-registered US pharmacy compounds it to that prescription. Lot test results are published at /quality/lab-results.
4. It ships refrigerated with your directions printed on the vial, with sterile syringes and alcohol prep pads.
5. Your physician stays reachable for questions through your account.

Step-by-step page: how to get MOTS-c prescribed online. Dosing detail is in MOTS-c dosage.