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“In 110 randomized controlled trials, evidence was found for glycine, sarcosine, N-acetylcysteine, some Chinese and ayurvedic herbs, ginkgo biloba, estradiol, and vitamin B6 to improve psychotic symptoms when added to antipsychotics.”
The Journal of nervous and mental disease • 2018 | View Paper
“Data from some recent studies indicate possible improvements in TD after switching antipsychotics or with the use of amantadine, levetiracetam, piracetam, zonisamide, propranolol, vitamin B6 , or certain unregulated herbal medicines; although significance of these improvements is unclear and require further investigation in randomized controlled trials.”
Expert review of neurotherapeutics • 2017 | View Paper
“Folate, S-adenosylmethionine (SAM) and eicosapentaenoic acid (EPA), for instance, seem to have … properties, zinc may be beneficial in attention deficit hyperactivity disorder (ADHD), vitamin B6 (pyridoxine) could reduce … side effects of antipsychotics and N-acetylcysteine (NAC) seems to be effective … negative symptoms, abnormal movements and akathisia in schizophrenia.”