RT Journal Article SR Electronic T1 Nutritional and herbal supplements in the treatment of obsessive compulsive disorder JF General Psychiatry JO Gen Psych FD BMJ Publishing Group Ltd SP e100159 DO 10.1136/gpsych-2019-100159 VO 33 IS 2 A1 Canan Kuygun Karcı A1 Gonca Gül Celik YR 2020 UL http://gpsych.bmj.com/content/33/2/e100159.abstract AB Obsessive-compulsive disorder (OCD) is a neuropsychiatric disorder that is characterised by obsessions and compulsions. The recommended treatments for OCD are cognitive– behavioural therapy using exposure and response prevention and/or pharmacotherapy. On the other hand, some nutritional and herbal supplements may be effective in the treatment of OCD. Nutritional and herbal supplements in OCD treatment will be reviewed in this paper. PubMed (Medline), Cochrane Library and Google Scholar databases were reviewed for the topic. There are some supplements that have been researched in OCD treatment studies such as vitamin D, vitamin B12, folic acid, homocysteine, trace elements, N-acetyl cysteine, glycine, myoinositol, St John’s wort, milk thistle, valerian root, curcumin and borage. The effectiveness of herbal and nutritional supplements in the treatment of OCD should be supported with more conclusive evidence.