DS is 3.5... Along with his numerous allergies he continues to have sleep issues as well as difficult behaviors (mostly aggression, defiance and constantly bothering others). Just curious what your experiences are in regards to testing for vitamin/mineral imbalances. I didn't get too far speaking with my son's pediatrician about this. We see his naturopath at the end of January so I will talk to her about it then. I would especially like to test magnesium levels. What have others done to test for these and have results seemed accurate?