Hi Deanna, just registered to site to see if I could gain help for my son's Tic's.  Read your post about Mag.  Calm is very good and does work for my son, but we have recently gone to a liquid mag found at our health store called LifeTime Vitamins - Liquid Magnesium Blend Orange Vanilla.  I think it works better than Calm does.  Its a bit chalky, but I usually mix it with 1/4 cup of orange sherbert and he drinks it right down.  Hope this helps.  
  
jb