Reference Vitamin E has been found in a number of studies to reduce the severity of TD. In a double-blind trial, people with TD were randomly assigned to receive vitamin E (800 IU per day for two weeks and 1,600 IU per day thereafter) or a placebo. Vitamin E was significantly more effective than placebo in reducing involuntary movements.¹ An uncontrolled study of 20 people with TD reported that 1,600 IU of vitamin E per day may be the optimal amount;² this large amount should be supervised by a healthcare practitioner. Other studies have also found that vitamin E supplements reduce the severity of TD.^{3 , 4 , 5} Two studies failed to show a beneficial effect of vitamin E.^{6 , 7} However, the people in those studies had been receiving neuroleptics for at least ten years, and research has shown that vitamin E is most effective when started within the first five years of neuroleptic treatment.^{8 , 9}

Reference Choline and Reference lecithin have both been used for people with TD. While some studies have shown a beneficial effect,^{10 , 11 , 12} others have reported variable improvement¹³ or no improvement.¹⁴ In a small, two-week, double-blind trial, people with TD were given 25 grams of lecithin twice a day (providing 35 grams of phosphatidyl choline per day), or a matching placebo. All participants experienced significant improvement of symptoms.¹⁵

One doctor has found that administering the trace mineral Reference manganese (15 mg per day) can prevent the development of TD and that higher amounts (up to 60 mg per day) can reverse TD that has already developed.¹⁶ Other researchers have reported similar improvements with manganese.^{17 , 18}

In a double-blind trial, supplementation with 10 mg of Reference melatonin each night for six weeks reduced abnormal movements by 23.8% in patients with TD, compared with 8.4% in the placebo group, a statistically significant difference.¹⁹

Preliminary research has linked TD to the inability of the body to metabolize the amino acid Reference phenylalanine. Supplementing with Reference branched-chain amino acids (BCAA), including valine, isoleucine, and leucine, could reduce excess phenylalanine in people with this disorder. In one trial, researchers examined the effects of BCAA supplementation in people with TD (from 150 mg per 2.2 pounds body weight, up to 209 mg per 2.2 pounds body weight) after breakfast and one hour before lunch and dinner for two weeks.²⁰ The BCAA mixture included equal parts valine and isoleucine plus 33% more leucine than either of the other two amino acids. Of nine people treated, six experienced at least a 58% reduction in symptoms, and all nine had a least a 38% decrease.

Reference Dimethylaminoethanol (DMAE) is a natural choline precursor. Although some preliminary data suggested that DMAE could decrease TD symptoms,²¹ most studies show that DMAE is no more effective than placebo for TD.²²

Several people have experienced an improvement in TD while taking Reference evening primrose oil (EPO).²³ In a double-blind study, however, supplementing with EPO (12 capsules per day) resulted only in a minor, clinically insignificant improvement.²⁴

Animal research and preliminary human reports suggest that L-tryptophan may be helpful for reducing the severity of tardive dyskinesia symptoms.^{25 , 26 , 27} Typical supplementation has begun with 2 grams per day of L-tryptophan, increasing to as much as eight grams per day, sometimes accompanied by a low-protein, high-carbohydrate diet and 25 mg/day of niacin (nicotinic acid).²⁸

During a ten-year period, doctors at the North Nassau Mental Health Center in New York treated approximately 11,000 people with Reference schizophrenia with a megavitamin regimen that included Reference vitamin C (up to 4 grams per day), Reference vitamin B3—either as niacin or niacinamide—(up to 4 grams per day), Reference vitamin B6 (up to 800 mg per day), and Reference vitamin E (up to 1,200 IU per day). During that time, not a single new case of TD was seen, even though many of the people were taking neuroleptic drugs.²⁹ Another psychiatrist who routinely used Reference niacinamide, vitamin C, and Reference vitamin B-complex over a 28-year period rarely saw TD develop in her patients.³⁰ Further research is needed to determine which nutrients or combinations of nutrients were most important for preventing TD. The amounts of niacinamide and vitamin B6 used in this research may cause significant side effects and may require monitoring by a doctor.

During a ten-year period, doctors at the North Nassau Mental Health Center in New York treated approximately 11,000 people with Reference schizophrenia with a megavitamin regimen that included Reference vitamin C (up to 4 grams per day), Reference vitamin B3—either as niacin or niacinamide—(up to 4 grams per day), Reference vitamin B6 (up to 800 mg per day), and Reference vitamin E (up to 1,200 IU per day). During that time, not a single new case of TD was seen, even though many of the people were taking neuroleptic drugs.³¹ Another psychiatrist who routinely used Reference niacinamide, vitamin C, and Reference vitamin B-complex over a 28-year period rarely saw TD develop in her patients.³² Further research is needed to determine which nutrients or combinations of nutrients were most important for preventing TD. The amounts of niacinamide and vitamin B6 used in this research may cause significant side effects and may require monitoring by a doctor.

During a ten-year period, doctors at the North Nassau Mental Health Center in New York treated approximately 11,000 people with Reference schizophrenia with a megavitamin regimen that included Reference vitamin C (up to 4 grams per day), Reference vitamin B3—either as niacin or niacinamide—(up to 4 grams per day), Reference vitamin B6 (up to 800 mg per day), and Reference vitamin E (up to 1,200 IU per day). During that time, not a single new case of TD was seen, even though many of the people were taking neuroleptic drugs.³³ Another psychiatrist who routinely used Reference niacinamide, vitamin C, and Reference vitamin B-complex over a 28-year period rarely saw TD develop in her patients.³⁴ Further research is needed to determine which nutrients or combinations of nutrients were most important for preventing TD. The amounts of niacinamide and vitamin B6 used in this research may cause significant side effects and may require monitoring by a doctor.

During a ten-year period, doctors at the North Nassau Mental Health Center in New York treated approximately 11,000 people with Reference schizophrenia with a megavitamin regimen that included Reference vitamin C (up to 4 grams per day), Reference vitamin B3—either as niacin or niacinamide—(up to 4 grams per day), Reference vitamin B6 (up to 800 mg per day), and Reference vitamin E (up to 1,200 IU per day). During that time, not a single new case of TD was seen, even though many of the people were taking neuroleptic drugs.³⁵ Another psychiatrist who routinely used Reference niacinamide, vitamin C, and Reference vitamin B-complex over a 28-year period rarely saw TD develop in her patients.³⁶ Further research is needed to determine which nutrients or combinations of nutrients were most important for preventing TD. The amounts of niacinamide and vitamin B6 used in this research may cause significant side effects and may require monitoring by a doctor.