Sorry to here your son's tics are so severe. We have found that removing dairy and potatoes from my son's diet, testing revealed intolerances, adding taurine, omega 3 and other vitamins he was deficient in reduced his tics dramatically. He also does not eat any packaged foods. The greatest reduction was when we removed the dairy. After being treated for yeast overgrowth, adding amino acids and acupuncture to his routine his tics are almost non-existant. He has flare ups occasionally but most of the time his family are the only ones to notice the tics now. I hope this helps.