Vitamin E in the treatment of tardive dyskinesia: a double-blind placebo-controlled study.Am J Psychiatry. 1992 Mar; 149(3):391-3.AJ
The authors compared vitamin E with placebo in a double-blind randomized crossover study of 27 patients with tardive dyskinesia. Each treatment period lasted for 6 weeks. Vitamin E showed no differences from placebo in the treatment of tardive dyskinesia.