A 2018 study into the effects of CBD on children with autism published in Neurology found “behavioral outbreaks were much improved or very much improved” by the use of CBD Here’s what they reported: 80% of parents noted a decrease in problematic behaviors, with 62% reporting significant improvements. Half of the children had improved communication. 40% reported significant decreases in anxiety. (Note: one-third of the study participants began the study with no anxiety.)