My son is 4 years old, has had tics on and off since he was 2. We did see a neurologist a year ago who thinks he will outgrow these tics. Sometimes he has motor tics, but lately frequent throat clearing is happening with TV, eating, reading books, being out in a public place. Any time he is excited or anticipating something he starts clearing his throat. It does wax and wane, but right now it's very frequent. His regular doctor has given us no course of action besides seeing the neurologist again. I'd like to start mag, but don't know know where to begin with all of this. Our doctor said he could test levels, but he just thinks they will all come back normal. What kind of mag should I start and how much, he is 42lbs and 4 years old. And then should I start calcium as well. He also has many enviromental allergies too. Should I get levels tested?? Thanks so much!