I spent 4 years talking about mental health and the connection to the gut brain axis. At the time I thought I was reaching the root of the problem by addressing the Glutathione as a Cerebral Substrate in Depressive Behavior Frontiers Can glutathione be a biomarker for suicide risk in women 18 months postpartum? Oxidative alterations in exfoliated oral mucosa cells of patients with major depressive disorder ScienceDirect