I'm not so sure of that. Not if the guy I quoted is who he claims to be.True. But they're made of a different type of mineral oil than the kind that's compatible with food.
They're actually scented naphtha, which is...lighter fluid/dry cleaning fluid, and a petrochemical. They're meant to be wiped on just to clean the surface and immediately wiped off.
Yet people leave it on for hours as though lighter/dry cleaning fluid is good for the wood.
He says he checked and according to the CAS# it's all 100% white mineral oil. Baby oil.
Here's the quote:
"Well, every lemon oil/fretboard conditioner I checked (all the big brands; Dunlop, D'ADDario, Dr.Duck, Music Nomad and more) are 100% White Mineral Oil (CAS# 8042-47-5)."