I’ve done many butcher-block countertops over the years (including a large one in my own house). I’ve always used a homemade mix of 2 parts pure bees wax : 2 parts canning-jar paraffin wax : 1 part pharmacy grade mineral oil (all by volume). All these items are food grade and there are no solvents involved. I grate the waxes into the oil and heat in a double boiler until it’s a liquid. Mix well and brush onto the butcher-block and warm it into the surface with a heatgun. The first application will take a few coats, which will soak in and really impregnate the wood surface. Let it cool between coats. When the surface won’t absorb any more coats it won’t absorb anything else either. Just hand buff it and it’s ready to use. Coffee, red wine, dark fruit juices, etc all just bead up and sit there waiting to be wiped off. No staining. I installed my counters maybe three years ago and they’re our main food-prep area; they look like the day I installed them. I reapply a coat of the same mix once a year (usually in the depths of winter when running the heat gun feels nice). The mix will cool in the container to about the consistency of paste wax and can be used the same way to touch up any area any time.
Jack