Boiled Linseed oil or Tung Oil work really nice as a preservative. Roll on a coat once/twice year. Mix with a little linseed based stain if you want a little color. These boards get a little drink on Tung Oil yearly.
Hey Sam, whole 30 is awesome. Wife and I do it every year. But this year I'm on it since Jan 1. I have one day I cheat a little. Brenda's skin cancer is much improved when sugar is taken out of her diet. I'm at my graduation weight 44 years ago!