A study claimed that ivermectin and mebendazole gave an 84.4% “clinical benefit” to cancer patients. That study has now been retracted by the journal Anticancer Research — meaning the journal pulled the paper because its problems could not be fixed with a correction.
Here is why that 84.4% number was misleading: patients whose cancer simply stayed about the same were counted as successes, many patients were also receiving normal cancer treatment such as chemotherapy, radiotherapy, or surgery, results were self-reported online with no independent check mentioned, doses were not standardized, and only 122 of the original 197 people finished the six-month follow-up. All of the authors were also affiliated with or paid by The Wellness Company, which sells the very protocols promoted in the paper.
Most important for pet owners: this was a human study, not a pet study. It does not prove ivermectin treats cancer in people, let alone in dogs or cats. Do not delay proven veterinary care to try an unproven drug combination. If your pet has cancer, talk to your veterinarian — and a veterinary oncologist if referred — about treatments backed by proper clinical evidence for that animal.
This video provides general education only, not medical or veterinary advice for any individual person or pet.
Source: Tech ARP fact-check, published October 23, 2026, on the Anticancer Research retraction in its October 2026 issue (Hulscher–McCullough ivermectin–mebendazole study).
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