Fish Oil for the Treatment of Depression in Patients With Multiple Sclerosis

This study will determine whether fish oil can reduce depression in people with multiple sclerosis (MS) who are mild to moderately depressed and are currently taking antidepressant medication. Study hypothesis: Three months of fish oil supplementation will improve depression scores on the Montgomery-Asberg depression rating scale (MADRS) or Beck Depression Inventory (BDI) better than placebo.