What do we know about juvenile idiopathic arthritis and vitamin D? A systematic literature review and meta-analysis of current evidence.

Over the last decade vitamin D (Vit D) has been the focus of considerable interest as a potential immunomodulator in a variety of conditions including autoimmune disease. Its influence in juvenile idiopathic arthritis (JIA) however is unclear. We therefore wished to clarify a possible link with the currently available evidence.