Publication date: Jun 23, 2025

First, the number of studies included was small, especially for brain regions outside of the occipital and medial frontal cortex. It plays a central role in protecting brain cells from oxidative damage by neutralizing harmful molecules known as free radicals. For example, some studies used different internal reference chemicals, which could influence the results. I was somewhat surprised by the sheer heterogeneity of the methodology used, Bell said. These studies provided data from 230 people with major depressive disorder and 216 healthy controls. The brain uses large amounts of oxygen and is particularly vulnerable to oxidative damage. These factors might affect glutathione levels but could not be examined in this meta-analysis. However, the authors acknowledged some limitations.

Semantics