Is BPC-157 banned in horse competition?

What does the FEI list actually say?

Only one of the four peptides owners ask about is named. The 2026 FEI list has "Thymosin (synthetic fragments)" as Banned, which covers TB-500. The others are not named, but the list also covers "any other substance with a similar chemical structure or similar biological effect(s)". We found no FEI ruling either way on these peptides, so nobody can honestly tell you they are clear. The FEI publishes a new list each year, so always check the current one.

What does Banned mean in practice?

Banned means off limits all the time, with no permitted window before a show. The points below come from British Equestrian's 2026 rules, which apply the FEI list at national level. For international events, read the FEI's own regulations on its Clean Sport site.

• Banned Substances are prohibited at all times. They are judged to have no legitimate use in the competition horse, or a high potential for abuse.
• Any amount counts. Unless the list sets a threshold, any reported quantity in a sample is a violation.
• Intent does not matter. There is no need to show intent, fault, negligence or knowing use.
• A positive test is not the only route. Use, attempted use and giving the substance can each be a violation.
• Having it at the yard can count. Possession is a violation unless you can show compelling justification.
• Testing is not limited to shows. Horses registered with the FEI or the national body can be tested out of competition.

Who is responsible if a horse tests positive?

Usually the rider. British Equestrian's rules define the Person Responsible as the competitor who rides, drives or vaults the horse, or a named adult if the competitor is a minor. It is that person's own duty to make sure no Banned Substance enters the horse's body.

Others can be held responsible too. Owners, coaches, grooms and vets may count as additional Persons Responsible if they made a relevant decision. That does not move the duty away from the rider, who remains ultimately responsible. An older FEI athlete guide makes the same point: this applies on a borrowed horse, and if you rely on your vet's word and the horse tests positive, you are still in violation.

What can happen after a positive test?

The consequences reach well past one result. Under British Equestrian's 2026 rules, results can be disqualified, and the rider and the horse can be provisionally suspended before a full hearing. The period of ineligibility for presence, use or possession of a Banned Substance is two years, which can be reduced in some circumstances, and a fine and legal costs apply as well. British Equestrian also reports positive findings to the FEI. Check the current rules for your level of competition.

How do USEF rules apply?

USEF rules point to the FEI for FEI-recognized disciplines. Under the 2026 GR4 rules, the FEI's anti-doping articles govern those disciplines for Banned Substances. For USEF purposes, the Person Responsible there is the trainer.

The trainer is any adult who has or shares responsibility for the care, training, custody, condition or performance of the horse. Riders, owners and support staff may also count as Persons Responsible. In other divisions, a prohibited substance includes any drug which might affect performance, along with its analogues. USEF also cautions against products of any kind whose ingredients are not specifically known, which is a fair description of a research vial.

Does racing have different rules?

Yes, and they leave little room. For US Thoroughbred racing, the HISA rule published in January 2023 lists thymosin as a Banned peptide hormone, and that category also covers other substances with a similar structure or effect. A separate category covers substances with no current approval for veterinary or human use. HIWU, the agency that enforces the program, has said drugs not approved by FDA are Banned Substances. The Responsible Person is the trainer, or the owner if there is no trainer, and is strictly liable for any Banned Substance in a sample.

A Thoroughbred is covered from its first timed workout until it is retired. We did not find BPC-157 named in the versions we could open, and lists change, so check HIWU's substance lookup. A 2025 doping control paper says the international racing federation (IFHA) also forbids thymosin beta-4. Outside the US, ask your racing authority.

What to do before you compete: talk to your vet

Treat your horse as if the strictest rule applies, and keep records. We do not cover detection or clearance times for these products, because the answer for a competition horse is not to use them.

• Do not give any peptide to a competition horse, in any form, including blends, sprays, oils and treats
• Ask your vet about approved treatments, and check each one against the rules before it is given
• If you are unsure about a substance, ask your federation or racing authority in writing
• Keep a record of everything your horse is given, and by whom
• Make sure grooms, riders and owners all follow the same rule
• If your horse has already had a peptide, tell your vet and ask your federation for advice before you enter a competition