A recent double blind randomized controlled trial involving 109 subjects showed that children with Vitamin D supplementation had a significant improvement in symptoms of autism compared to placebo, (Khaled Saad, Ahmed A. Abdel-Rahman, Yasser M. Elserogy, Amira A. El-Houfey, Hisham A. K. Othman, Geir Bjorklund, et. al., "Randomized Controlled Trial of Vitamin D Supplementation in Children with Autism Spectrum Disorder," Journal of Child Psychiatry and Psychology (October 2016): doi: 10.1111/jcpp.12652. Improvements were seen in the Childhood Autism Rating Scale (CARS) in relating to people, emotional response, imitation, body use, object use, adaptation to change, listening response, visual response and general autistic impression. There were improvements in the Social Responsiveness Scale (SRS) in autistic mannerisms, social cognition and social awareness, in the Autism Treatment Evaluation Checklist in sociability. cognitive awareness and behavior, and the Aberrant Behavior Checklist (ABC) in irritability, hyperactivity, social withdrawal, stereotypical behavior and inappropriate speech subscales. although this was a small study and more research needs to be done to further validate these results, it is prudent to check Vitamin D levels and if low to ask a physician or other qualified health care professional regarding supplementation.