What does the research say? I-CBT now has a meaningful evidence base. Multiple randomised controlled trials have found it to be as effective as standard CBT for OCD in reducing symptom severity. Importantly, several studies have also found that I-CBT tends to be better tolerated — with lower rates of dropout and higher ratings of acceptability compared to ERP-based approaches. A 2024 multisite randomised controlled trial found significant improvements in OCD symptoms in both