Academy of Sciences: Researchers gave 50 to 100 mgs. of Rhododendron Caucasicum per day for three weeks to 114 patients hospitalized for depression. Results: Marked decrease in depressive symptoms in 93 of the patients. No change in the control group who had received green tea extract (which contains proanthocyanadins).

Moscow State Hospital: 185 patients with severe depression were treated with Rhododendron Caucasicum Results: Positive improvements in 162 patients.