K.C.
Just wanted to share some info on mineral oil, which someone had recommended. Although it sounds very natural, it is actually made from petroleum products and is not safe to use, especially on eating surfaces like cutting boards. Here is a link to an MSDS form (Material Safety and Data Sheet - I am an environmental scientist and I commonly look at these types of things). http://www.jtbaker.com/msds/englishhtml/M7700.htm
Here's a brief blurb from the MSDS.
MINERAL OIL: WARNING! HARMFUL IF SWALLOWED OR INHALED. CAUSES IRRITATION TO SKIN, EYES AND RESPIRATORY TRACT. COMBUSTIBLE LIQUID AND VAPOR.