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Major depressive disorder (MDD) and bipolar depression (BD) can often be difficult to treat. N-acetylcysteine (NAC) is a nutraceutical product that has been trialed in a large number of neuropsychiatric and medical disorders, with mixed results. Many randomized controlled trials (RCTs) have studied NAC augmentation as an intervention in MDD and BD. These RCTs were pooled in 2 recent meta-analyses. One meta-analysis with 7 RCTs (pooled N = 728) conducted in patients with MDD or BD found that NAC was not superior to placebo in the attenuation of depression ratings in either main or sensitivity analyses. The other meta-analysis with 6 RCTs (pooled N = 248) conducted in patients with BD found a small, imprecise effect size for NAC (standardized mean difference, 0.45; 95% confidence interval, 0.06-0.84). The advantage for NAC in this meta-analysis would almost certainly have been lost had the authors excluded from analysis 2 RCTs, both of which had problematic characteristics and findings and both of which also obtained a large and statistically significant advantage for NAC. At present, therefore, evidence does not encourage the use of NAC as an augmentation treatment for patients with MDD or BD. It remains to be seen whether NAC augmentation benefits depressed subpopulations, such as those with higher levels of inflammatory biomarkers at baseline.

N-Acetylcysteine Augmentation for Patients With Major Depressive Disorder and Bipolar Depression