This is what I use for chopping boards:
Food Grade Mineral Oil | Stella Food Grade Oils
$44 for 5L and $129 for 20L
On the page it blubs about FDA 21 CFR 172.878 which says this
https://www.accessdata.fda.gov/scrip...cfm?fr=172.878 and
CFR - Code of Federal Regulations Title 21
I'm not a scientist and haven't read these dense texts. But it does say quite clearly it is safe and considered safe to use for food items.
Its soaked in a massive plastic tub for 24 hours then left to drip dry on their side. It has fabulous hydrophobic qualities and repels stains pretty much permanently. A quick wipe with a little bottle of it once a week keeps the board looking nice.
Regarding above, the post says "Motor oil is now labeled in California as a carcinogen, and they warn against any skin contact. Mineral oil comes from the same crude oil source." I happen to know this means USED motor oil. As for "Mineral oil comes from the same crude oil source" so does an absolutely astounding number of products we eat, use, bathe in and apply. Crude oil derivatives have seemingly unlimited applications.
Interesting topic.
addendum/edit: to reduce my ignorance further I had a hunt around. Other than quite a few alarmist crackpots and mummy-bloggers there isn't too much general info (real) that isn't scientific in nature. I did however find this:
https://en.wikipedia.org/wiki/Minera...od_preparation