Corn-free Gums? in Gluten-Free Recipes & Cooking Tips Posted May 19, 2009 · Report to Admin Guar gum is corn-free (it's from a tropical bean pod). It works the same as xantham gum and I think the substitution is 1:1... maybe someone else will know for sure. Guar gum is great. It's also much cheaper than xanthan gum. I use about 50% more guar gum than the recipe calls for in xanthan gum.