In short: Counterfeit GLP-1 medicines are real and have reached the regular U.S. supply chain: the FDA has warned about fake Ozempic pens three times, in December 2023, April 2025 and December 2025, and seized thousands of units. Fakes may contain the wrong ingredient, the wrong amount or none at all, and FDA found counterfeit needles whose sterility could not be confirmed. The safest steps are to get a prescription, fill it at a state-licensed pharmacy, check the pen and carton before every use, and never buy “semaglutide” or “tirzepatide” sold without a prescription or “for research purposes”.
This page explains the FDA alerts, how fake and illegally sold products differ from compounded medicines, and a checklist for spotting problems. Compounded semaglutide and tirzepatide are a separate topic with their own risks; our guide to compounded GLP-1s covers them. For the real medicine, see Ozempic and GLP-1 medications. Alerts were checked on fda.gov on October 7, 2026. This is general education: if you think your medicine may be fake, don’t use it, and contact your pharmacist or clinician.
Counterfeit, illegal, compounded: three different problems
- Counterfeit products pretend to be a brand-name medicine. The FDA says they “claim to be authentic, but could contain the wrong ingredients, contain too little, too much or no active ingredient at all or other harmful ingredients, and are illegal.”
- Illegally sold products are sold without a prescription, often online, or labeled “for research purposes” or “not for human consumption”. The FDA has warned companies selling semaglutide, tirzepatide, retatrutide, survodutide and mazdutide this way. Some are counterfeit; none are FDA approved.
- Compounded versions are made by pharmacies for individual prescriptions. They are legal in some circumstances but are not FDA approved, and the FDA has received reports of adverse events and dosing errors with them. They have their own page: compounded GLP-1s explained.
The FDA’s counterfeit Ozempic alerts
All three alerts involved the 1 mg Ozempic (semaglutide) injection pen, a diabetes medicine that is also widely used off label for weight. Each time, the FDA asked patients, pharmacies, wholesalers and health professionals to check the products they had received and not use, sell or distribute the ones described.
FDA counterfeit Ozempic alerts, as of October 7, 2026
- December 21, 2023Thousands of units seized. Lot NAR0074 with serial number 430834149057. Needles, pen label, carton and leaflets were counterfeit; needle sterility could not be confirmed.
- April 14, 2025Several hundred units in the U.S. supply chain, seized April 9. Lot PAR0362 with serial numbers starting 51746517.
- December 5, 2025Dozens of units seized after Novo Nordisk alerted the FDA on November 18. Lot PAR1229, also a real lot number: on the fakes, the "EXP/LOT" text sits to the left of the date and lot, not above them.
Two details are worth knowing. First, in the 2025 case the counterfeit lot number was also an authentic one, so a lot number on its own doesn’t prove a pen is real; the FDA pointed to the position of the printed text instead. The FDA added that patients who received lot PAR1229 through Novo Nordisk’s patient assistance program could keep using it, because those pens were authentic. Second, these fakes were found in the legitimate supply chain, not only on shady websites, which is why the FDA urges pharmacies to buy only from the manufacturer’s authorized distributors.
The adverse events the FDA knew about were reassuring so far: in 2023 it was aware of five reports for the counterfeit lot, none serious and all consistent with Ozempic’s common side effects, and in both 2025 alerts the six reports for the lot did not appear to be linked to the counterfeit product. But testing of the seized pens was still underway in each case, so the contents were unknown at the time of the alerts.
What researchers found when they bought “semaglutide” online
In a pair of 2024 studies, Ashraf and colleagues searched Google and Bing for semaglutide sold without a prescription in July 2023. Of 317 links to online pharmacies, 134 (42.3%) led to illegal sellers. The team then tried to buy from six of them. The three sites selling prefilled Ozempic-style pens never delivered; instead they asked for extra “customs” payments of $650 to $1,200, which customs agencies confirmed were fraud. The three vials that did arrive were all judged probably substandard or falsified, contained endotoxin (a bacterial contaminant), and had semaglutide purity of only 7.7% to 14.4%, far below the 99% claimed on their labels.
| Item | Value |
|---|---|
| Purity claimed on label | 99% |
| Highest purity measured | 14.37% |
| Lowest purity measured | 7.70% |
Endotoxin was found in all three samples. The three prefilled pens ordered were never delivered (non-delivery scams).
Source: Ashraf AR et al., Journal of Medical Internet Research 2024 (3 vials from illegal online pharmacies) (checked on October 7, 2026)
Where fakes come from: buying online safely
The National Association of Boards of Pharmacy (NABP), which accredits online pharmacies, reports that nearly 95% of websites offering prescription-only drugs operate illegally, and that 96% of the illegal online pharmacies it reviewed did not require a valid prescription. A website ending in .pharmacy has been accredited by NABP, and unlike a logo, that web address can’t be faked; NABP’s Safe Site Search tool lets you check any pharmacy website.
Online pharmacy facts
- Nearly 95%of websites offering prescription-only drugs online operate illegallyNABP
- 96%of illegal online pharmacies NABP reviewed did not require a valid prescriptionNABP
- 42.3%of online-pharmacy links found when searching for semaglutide led to illegal sellers (July 2023)Ashraf AR et al., JAMA Network Open 2024
Checked on October 7, 2026
The FDA’s BeSafeRx campaign lists the signs of a safe online pharmacy and the warning signs of an unsafe one:
| Likely safe if it… | Possibly unsafe if it… |
|---|---|
| Always requires a prescription | Doesn’t require a prescription |
| Gives a physical U.S. address and phone number | Isn’t licensed in the U.S. and by your state board of pharmacy |
| Has a licensed pharmacist to answer questions | Has no licensed pharmacist |
| Is licensed with a state board of pharmacy | Offers prices that seem too good to be true |
| Sends medicine that looks different, or arrives broken, damaged, in a foreign language, with no expiration date, or expired |
Telehealth programs can be a legitimate way to get a prescription, but check who prescribes and which pharmacy fills it; our telehealth weight-loss programs compared and telehealth weight loss guide explain what to ask. If cost is pushing you toward a cheap online source, look first at Ozempic cost, GLP-1 coverage and our cost hub.
Pen and package checklist
Check every new box before the first injection. Compare it with the patient leaflet and the photos in your manufacturer’s instructions, and with the pen you have used before.
Before I use a new GLP-1 pen
- ☐ It came from a state-licensed pharmacy, with a pharmacy label in my name
- ☐ The carton is sealed, undamaged and printed in English, with an expiration date that hasn’t passed
- ☐ The lot number and expiration date on the carton match the ones on the pen
- ☐ The lot is not one named in an FDA counterfeit alert (NAR0074 with serial 430834149057; PAR0362 with serials starting 51746517; PAR1229 with “EXP/LOT” printed to the left of the date)
- ☐ The pen label, colors, dose and needles look the same as the leaflet pictures and my previous pens
- ☐ The medicine looks the way the leaflet describes
- ☐ It is a pen or tablet approved in the U.S., not a powder vial sold online or “for research”
- ☐ If anything looks off: don’t inject; call the pharmacy and the manufacturer
From instatuck.com, checked against FDA alerts and BeSafeRx on October 7, 2026. Education only; not medical advice.
Compounded products: a related warning
The FDA’s page on unapproved GLP-1 drugs (content current as of October 1, 2026) reports that, as of May 31, 2026, it had received 990 reports of adverse events linked to compounded semaglutide and more than 730 linked to compounded tirzepatide, and that some reports involved dosing errors from measuring doses from vials. It also warns that some compounders have used salt forms, such as semaglutide sodium and semaglutide acetate, which are different active ingredients from the approved medicines, and notes one adverse event with a product labeled as compounded tirzepatide from a pharmacy that hadn’t actually made it. That last case is a reminder that fake “compounded” labels exist too.
Misleading marketing: words to watch for
Even legal sellers can blur the lines. On March 3, 2026, the FDA announced warning letters to 30 telehealth companies over false or misleading marketing of compounded GLP-1s. The problems it described included suggesting a compounded drug was the same as, or a generic version of, an FDA-approved medicine; implying the product was FDA approved or had been evaluated for safety and effectiveness; and branding compounded drugs with the telehealth firm’s own name so it wasn’t clear who actually made them. The FDA stressed that compounded drugs are not FDA approved and are not the same as generics, which do go through FDA approval.
So when you shop for a program, be wary of phrases like “generic Ozempic”, “same as Wegovy” or “FDA-approved semaglutide” attached to a product that isn’t the brand-name pen or tablet. Ask plainly: is this the FDA-approved product, or a compounded one, and which pharmacy makes it? A trustworthy prescriber will answer without hesitation.
If you think your medicine is fake
- Don’t use it. Keep the pen, carton and receipt.
- Call your pharmacy and the manufacturer to check the lot and serial number.
- Talk to your clinician about any symptoms, and about how to restart safely with a genuine supply.
- Report it to the FDA. Side effects and product problems go to MedWatch (online or by fax at 1-800-FDA-0178); websites selling suspect medicines can be reported to the FDA as well.
The bottom line
Fake GLP-1s have reached U.S. pharmacies, and illegal online sellers are common. A prescription, a state-licensed pharmacy and a quick check of every new box are your best protection. If you are just starting out, our questions to ask before starting a GLP-1 include where to fill the prescription, and our directory helps you find a provider who prescribes and follows up. And be just as wary of “GLP-1” supplements that promise the same effect; our “nature’s Ozempic” explainer explains why.
