Can I give my cat human peptides?

Three kinds of human product, three different risks

Work out which kind of product you have first, because the rules and the risks differ. None of these is approved for cats.

Semaglutide for cats: can a vet prescribe it?

A vet may, in limited cases. You may not. Semaglutide is approved for people: FDA approved Wegovy to reduce excess weight in certain adults and children with obesity. Tirzepatide (Zepbound) is approved for chronic weight management in adults, and liraglutide is approved for type 2 diabetes. The ASPCA says none of these GLP-1 drugs is currently approved for veterinary use.

A federal law called AMDUCA lets vets use approved human drugs in animals in ways the label does not cover. FDA explains that this extra-label use is allowed only on the lawful order of a licensed vet, inside a valid vet-client-patient relationship. The vet takes responsibility, knows your cat well enough to make at least a preliminary diagnosis, and is available for follow-up. It is limited to cases where an animal's health is threatened or it may suffer or die without treatment. The permission belongs to the vet, not to you, and the rules do not allow promoting such uses.

Is a GLP-1 drug for cats coming?

One is being tested, and none is approved. In December 2025 a company called Okava began a study called MEOW-1 of OKV-119, a small implant that releases exenatide, a GLP-1 drug, for up to six months. The study planned to enrol up to 50 cats. The company said it aims to file for FDA approval in 2027 or 2028. Those are company plans, not results.

Until something is approved, weight loss in cats is a job for diet and your vet. See GLP-1 and cats and weight loss in cats for what is known.

Human BPC-157 for cats: what is in a research vial?

Nobody can promise you. Most BPC-157 and TB-500 vials are labelled "research only" and are approved for no one. FDA does not check these products, so the label may not match what is inside. FDA has warned about the same labels on GLP-1 products, calling them of unknown quality and possibly harmful, and says fake products can hold the wrong amount of active ingredient, none at all, or other harmful ingredients.

Cats face one extra risk. These powders are often mixed with bacteriostatic water, and the prescribing information for that water says it contains benzyl alcohol as a preservative. Cornell's vet school lists benzyl alcohol as possibly very toxic to cats.

BPC-157 returns no PubMed results at all for cats, and no clinical trial of these peptides in cats appears there. It is not officially tested in cats. Read what is known about safety before anything else.

Human supplements and chews: what to check for cats

Check every ingredient. FDA says xylitol does not seem as dangerous for cats as for dogs, possibly because cats dislike sweets, but it is still worth keeping away from them. Cornell's vet school lists vitamin D and iron among products that can poison small animals, and both appear in human supplements. If you want to give your cat a supplement, show the label to your vet first.

If your cat got into a human peptide pen or vial

Call your vet or an emergency clinic now. The ASPCA says pets are exposed by chewing pens or vials, licking residue after an injection, or being given medicine meant for a person. The most reported signs are vomiting, diarrhea, tiredness and poor appetite, with low blood sugar and pancreatitis less likely but possible. Pet Poison Helpline has described a diabetic cat given semaglutide in place of insulin who became nearly comatose with very low blood sugar. If your cat has diabetes, make sure every carer knows which pen is which.

• Move your cat away from the product and check it is breathing and acting normally.
• Do not try to make your cat vomit or give home remedies unless a vet or poison line tells you to.
• Keep the pen, vial or packaging and take it with you.
• Call your vet or an emergency clinic. You can also call ASPCA Animal Poison Control on (888) 426-4435 or Pet Poison Helpline on (855) 764-7661. Both answer around the clock, and a fee may apply.
• Go to an emergency clinic now if your cat is wobbly, very sleepy, collapses or has a seizure.

Questions to ask your vet

Tell your vet about every human product your cat might reach or has been given. Then ask:

• Is there an approved cat medicine for this problem?
• Would you ever use a human drug for my cat here, and why?
• Is anything in this supplement or vial unsafe for cats?
• What signs mean I should bring my cat in straight away?
• How should I store my own pens and medicines so my cat cannot reach them?