Retraction Note to: Effect of N-acetyl cysteine (NAC) supplementation on positive and negative syndrome scale in schizophrenia: a systematic review and meta-analysis of randomised controlled trials.

The authors have retracted this article [1] because there are fundamental errors in the data presented that undermine the conclusions drawn. All authors agree with this retraction. The authors are re-analysing their data and intend to submit a new manuscript for peer review in due course.