Boos Block Board Cream, 5 oz (BWC). Official formula is unbleached beeswax and food-grade mineral oil. NSF certified. John Boos lists it after Mystery Oil: an even coat, overnight, then wipe the extra. Official page says the higher wax content is the moisture barrier for storage or light use. Specs from John Boos' Boos Block Board Cream page (5 oz).
The beeswax cream. Oil first, then this, on a Boos board.