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Ulrich reiterated that view in a 1 July email to ScienceInsider: “The analysis by Walach et al. was done in my opinion responsibly and without flaws,” she wrote.

They are: Harald Walach, a clinical psychologist and science historian by training who describes himself as a health researcher at Poznan University of Medical Sciences in Poland; Rainer Klement, a physicist who studies ketogenic diets in cancer treatment at the Leopoldina Hospital in Schweinfurt, Germany; and Wouter Aukema, an independent data scientist in Hoenderloo, Netherlands.

Walach, the first author, says he stands by the paper.

“It’s a fascinating time to be in this market,” says Elad Walach, CEO of the Tel Aviv–based start-up Aidoc.

“Initially they’re skeptical, but after two months they get used to it and are very trusting,” Walach says.