Evaluation of the Relationship Between Vitamin Levels and Symptom Severity in Adults With Attention-Deficit/Hyperactivity Disorder

A comparative study of 35 adults with ADHD and 36 matched controls found significantly lower serum B12 and vitamin D levels in the ADHD group, with both vitamins showing negative correlation to symptom severity scores. The authors suggest biochemical factors may contribute to ADHD's neurobiological basis and recommend routine vitamin assessment in adult ADHD evaluation.