Graham,
I'm starting to wonder that as well.
The Mark Raby 'Treatex' meets with (Shamlessly lifted from his site);
Regulation DIN68861-1B. Resistance to water, wine, beer, coffee, tea, fizzy drinks, etc.
Toy safe DIN EN 71-3.
Certified anti-bacterial to standard JIS Z2801-2000.
Meets with VOC emissions.
I don't see one that says food safe (and can't find a defined reference either - not even for the Chestnut Food Safe oil). But the list of ingredients are all generally acceptable.