Counterfeit Ozempic and Other Fake GLP-1s: Real Cases and Checks

Yes, counterfeit Ozempic has turned up in the United States, and not only on sketchy websites. FDA has seized fake Ozempic 1 mg pens that slipped into the legitimate US drug supply chain three separate times, in December 2023, April 2025 and November–December 2025. Below are the real cases, the label clues FDA has published, and what to do if a pen or carton looks wrong.

This post is about spotting and handling a suspected fake. If you're still choosing where to buy, start with our guide to checking whether an online pharmacy is legitimate.

Has counterfeit Ozempic really been found in the US?

Yes. FDA's counterfeit Ozempic alert covers three incidents. Each involved fake pens that were sold outside Novo Nordisk's authorized distribution and then got into the legitimate supply chain, which is the part that surprises people.

When FDA posted it	Lot number	Other identifiers FDA gave	What FDA found
December 21, 2023	NAR0074	Serial number 430834149057	Thousands of units seized. The needles, pen label, carton and patient/professional information were counterfeit too, so the needles' sterility couldn't be confirmed.
April 14, 2025	PAR0362	Serial numbers starting with 51746517	Several hundred units. Novo Nordisk notified FDA on April 3, and FDA seized them on April 9. The contents had not yet been identified.
December 5, 2025	PAR1229	"EXP/LOT" printed to the left of the expiry and lot on the pen label (it sits above them on real pens)	Dozens of units seized after Novo Nordisk alerted FDA on November 18. Testing of the contents was still ongoing.

Two details stand out. In 2023, FDA said "some counterfeit products may still be available for purchase," so a seizure doesn't mean every fake was caught. And PAR1229 is also a real lot number. Novo Nordisk made genuine PAR1229 pens, and FDA says people who got that lot through Novo Nordisk's Patient Assistance Program can keep using it. A lot number that matches an alert doesn't automatically mean your pen is fake, and a lot number that doesn't match doesn't prove it's real.

Are Mounjaro, Zepbound or Wegovy counterfeits on FDA's list?

As of FDA's page on unapproved GLP-1 drugs (last updated October 1, 2026), the counterfeit product FDA names is Ozempic. The same page also warns about fraudulent compounded semaglutide and tirzepatide. Those are products whose labels list pharmacies that don't exist or didn't make them. That isn't quite a counterfeit brand-name pen, but the risk is the same: you don't know what's inside.

The problem isn't limited to the US. In June 2024, the World Health Organization issued a medical product alert on three falsified Ozempic batches found in Brazil, the UK and the US, and said reports of falsified semaglutide had been rising in every region since 2022. WHO also warned that some fakes may contain other undeclared active ingredients, such as insulin, which is a very different risk from "just a weak dose."

What's actually wrong with a fake pen?

FDA's general counterfeit guidance says a fake medicine may contain:

• the wrong ingredient
• too much, too little or none of the active ingredient
• other harmful ingredients

With an injectable there's one more layer: sterility. In the 2023 case, the needles themselves were counterfeit, and FDA flagged a possible infection risk. A pen can look nearly perfect and still have no sterility guarantee.

The adverse events FDA reported for these lots are reassuring in one way and humbling in another. For the 2023 lot, FDA knew of five reports, none serious, all matching known Ozempic effects like nausea and constipation. For the 2025 lots, the reports FDA described appeared linked to authentic product. So you can't use "I feel fine" or "I feel sick" to decide whether a pen is real. Symptoms don't sort fakes from genuine pens.

How to check your pen and carton: a 2-minute routine

Do this each time a new box arrives, before the first dose from it:

1. Compare it with your last box. FDA lists "looks different from what you normally get" as a top warning sign. Look at the print quality, colors, fonts, carton seal and the pen's shape and color.
2. Read the pen label closely. For Ozempic, check where "EXP/LOT" sits. FDA says the 2025 PAR1229 fakes had it to the left of the dates, while on genuine pens it's above.
3. Check lot and serial numbers against FDA's alert page. Search FDA's site for "counterfeit Ozempic" and compare. Remember that a match is a reason to ask, not proof.
4. Look for WHO's red flags. In its 2024 alert on falsified Ozempic, WHO listed spelling mistakes on the carton, a poor-quality or badly stuck-on label, and a scale that extends out of the pen when you set the dose.
5. Look at the needles and paperwork. In 2023, the needles and leaflets were fake too. Torn, reprinted or oddly worded inserts are a reason to pause.
6. Notice the source. A pen that came from a friend, a social media seller or a "no prescription needed" site has skipped every check this list depends on.

If you track your pens in an app, logging the lot number with each new box takes five seconds. In GLPily you can add it to the shot log's note, so if an alert comes out later you can scroll back and see exactly which lot you used and when.

What to do if you think a GLP-1 pen is fake

Don't inject it. FDA's advice is clear: don't use a product you reasonably suspect is counterfeit. Then:

1. Keep everything. Keep the pen, carton, inserts, needles, shipping box and receipt. Take clear photos of the label, lot and serial numbers.
2. Call the pharmacy that dispensed it. Pharmacists can check lots and, for Ozempic, FDA tells them to contact Novo Nordisk customer care at 1-800-727-6500 (Monday–Friday, 8:30 a.m.–6 p.m. ET).
3. Tell your prescriber, especially if you've already used some of it or missed doses because of it. They can advise you on next steps for your treatment.
4. Report it to FDA.
   • Side effects or reactions: MedWatch online, or by fax at 1-800-FDA-0178. See our walkthrough on reporting a GLP-1 side effect through MedWatch.
   • Suspected counterfeit or criminal selling: FDA's Office of Criminal Investigations reporting form, or your local FDA consumer complaint coordinator.
   • Unsafe online sellers: FDA's report-a-problem form at contact.fda.gov.
   • General questions: 1-888-INFO-FDA (1-888-463-6332).
5. Get medical help if you feel unwell. For severe symptoms, call 911. For a possible poisoning, call Poison Control at 1-800-222-1222.

Why "cheap" is often the giveaway

Most counterfeit stories start the same way: the price is too good, or the seller skips the prescription. A product that's sold as "research use only" but marketed with weight-loss photos is its own category of risk. We cover what that label really means in our explainer on "research use only" peptides. And if you're weighing a compounded option, these red flags are worth a read first.

The honest takeaway is a little humbling: no home check can prove a pen is genuine. Your best protection is a prescription filled by a state-licensed pharmacy, plus the habit of looking at each new box before you use it.

Common questions

Can I tell a fake Ozempic pen just by looking at it?

Sometimes, but not reliably. FDA has published specific clues for specific lots, like where "EXP/LOT" sits on the label of the PAR1229 fakes. A good fake can still pass a visual check, and that's why the source matters so much.

My Ozempic has lot number PAR1229. Is it counterfeit?

Not necessarily. FDA notes that PAR1229 is also a genuine lot. Check where "EXP/LOT" appears on the pen label. If it's to the left of the dates, don't use the pen and call your pharmacy. If you're unsure either way, ask the pharmacist before injecting.

Have fake Mounjaro or Zepbound pens been found?

FDA's counterfeit warnings to date name Ozempic. FDA has separately warned about fraudulent compounded semaglutide and tirzepatide with false label information. Any tirzepatide product that looks or behaves differently deserves the same checks and reports.

Who do I report a suspected counterfeit to?

Report reactions to FDA MedWatch and suspected counterfeits or criminal sellers to FDA's Office of Criminal Investigations. Also tell your dispensing pharmacy. For Ozempic, the pharmacy can contact Novo Nordisk at 1-800-727-6500.