Currently I don't. In the future I would have separate products if I want to make a combo. Selenium would be a great candidate to add but at this point I'm not sure how much to add, its tricky when you think about it because selenium's daily value is much more inflexible than iodine's. But silica I think would be an excellent one. Going to do more research on how they work together but silica usually greatly increases bioavailability and permeation of other compounds. Its no simple thing to make silica though, I give a good recipe I developed here: http://www.naturehackerproducts.com/2015/06/placeholder_91.html?m=1