They've been working together remotely on an informal and voluntary basis during the pandemic.
The BBC can reveal that more than a third of 26 major trials of the drug for use on Covid have serious errors or signs of potential fraud.
None of the rest show convincing evidence of ivermectin's effectiveness.
Dr Kyle Sheldrick, one of the group investigating the studies, said they had not found "a single clinical trial" claiming to show that ivermectin prevented Covid deaths that did not contain "either obvious signs of fabrication or errors so critical they invalidate the study".
Out of a total of 26 studies examined, there was evidence in five that the data may have been faked
On top of these flawed trials, there were 14 authors of studies who failed to send data back.
The independent scientists have flagged this as a possible indicator of fraud.
The sample of research papers examined by the independent group also contains some high-quality studies from around the world.
A recent study in Lebanon was found to have blocks of details of 11 patients that had been copied and pasted repeatedly
they have submitted a retraction to the scientific journal which published it
Study from Iran
Another study from Iran seemed to show that ivermectin prevented people dying from Covid.
The records of how much iron was in patients' blood contained numbers in a sequence that was unlikely to come up naturally.
Dr Morteza Niaee, who led the Iran study, defended the results and the methodology and disagreed with problems pointed out to him,
adding that it was "very normal to see such randomisation" when lots of different factors were considered
Ivermectin is generally considered a safe drug, though there have been some reports of side effects.
But indirect harm can come from giving people a false sense of security, especially if they choose ivermectin instead of seeking hospital treatment for Covid, or getting vaccinated in the first place.
Some groups regularly contain posts about conspiracy theories of ivermectin cover-ups, as well as pushing anti-vaccine sentiment or encouraging patients to leave hospital if they aren't getting the drug.
South African nurse dies
Instead of consulting a doctor, she continued with the ivermectin and got home oxygen.