Reply by Charlie

If he has a nut allergy, then don’t use ANYTHING related to nuts. No oils, no wood, no nothing. I worked with a guy that had a nut allergy. If someone made Hazelnut COFFEE, he couldn’t be in the building. Just the airborne stuff in the vapors would cause a reaction. Now I’m sure there are various levels of sensitivity as with any allergy, but don’t take a chance. Avoid anything related to nuts.
You can safely and easily use mineral oil on the cutting board. It’s very plain. It ain’t fancy. But it’s also very safe.