The study was done where it was approved for use in food, in Brazil.
It is approved for use in foods in Brazil, alongside other countries like the European Union, Australia, New Zealand, South Africa, and Korea.
https://www.sciencedirect.com/science/article/abs/pii/B9780124046993000743
Thanks for that link. Apparently there are several reasons why it won’t be used more in foods. I’m checking a few studies about it and the one I like is that it can used as a fungicide. Talk about all pupose.