I have put him on supplements (Quitt, and something else that I can't remember the brand name of, just a general supplement) before to try to fix the wood chewing (he has done this for a long time). It slows him down... maybe but its probably just hopeful thinking. I am fairly sure that's a boredom thing because he only does it when he is in the paddock or stalled.
What should I add as a supplement? Do you have any recommendations?