How many studies support Cognitive Behavioral Therapy?

Beyond its well-established efficacy for anxiety and depression, CBT has strong, replicated randomized-trial evidence for chronic insomnia — a flagship meta-analysis in Annals of Internal Medicine, later refined by a component network meta-analysis identifying which parts of the therapy drive benefit — with further meta-analyses confirming gains in insomnia patients with comorbid mental disorders or chronic disease, and improved quality of life. That's backed by 7 published studies in Vitaebase's database, including 6 meta-analyses, the most recent from 2025 -- a modest but real research base.