Most studies that use magnesium oxide, or other poorly absorbed forms of magnesium, make no mention of the wide range of absorption characteristics of various magnesium formulations alluding to the lack of appreciation of this important variable. Studies that correlate magnesium levels with attention deficit disorder (ADD) and attention deficit hyperactivity disorder (ADHD) or use magnesium supplements to treat these disorders are poorly done and have multiple research design flaws, though there are notable exceptions. ADHD has multiple variants but is commonly thought to be exclusive to children; adult ADD and ADHD, though, may be among the most underdiagnosed psychiatric disorders and concomitant with the prediabetes and diabetes epidemic may be present in unprecedented numbers. Symptoms of adult ADD and ADHD can include “inattention, distractibility, restlessness, labile mood, quick temper, overactivity, disorganization, and impulsivity”. Electroencephalograms are useful non-invasive measures of brain electrical activity that correlate with changes in cortical activity and function.