Vitamin D deficiency is causing everything from depression to cancer to COVID-19, at least that’s what our patients are hearing. Paul Riordan looks at the strength of that research and clarifies when to check levels and when to supplement.

There are many fairly benign interventions that are tried in child and adolescent mental health, and a large number are specifically aimed at treating Attention Deficit Hyperactivity Disorder (ADHD). One such treatment is the use of vitamin D. But is it helpful, and if so, what dosages are safe to use? This article uses current research to address these questions.