The best oils for treating your cutting board include food-grade mineral oil, which is safe, odorless, and resistant to rancidity, as well as beeswax blends that add an extra layer of protection and a smooth finish. Fractionated coconut oil is another great option, offering antibacterial properties without the risk of spoilage. Specialty cutting board oils often come pre-mixed with natural extracts for added benefits. However, avoid using vegetable oils like olive, canola, or sunflower oil, as these can spoil over time, leading to unpleasant odors and potential bacterial growth.