GABA (Gamma-Aminobutyric Acid)

Microbial GABA Production#

Lactobacillus reuteri, L. brevis, and Bifidobacterium species are the primary GABA-producing gut bacteria. Microbial GABA acts locally on enteric neurons (vagal afferents) and may contribute to circulating GABA levels.

Dysbiosis-driven loss of GABA-producing commensals is associated with anxiety and depressive phenotypes.^{[1]The Gut-Brain Axis in Depression, Anxiety, and Schizophrenia: A Scoping Review of Mechanisms, Biomarkers, and Therapeutic ImplicationsEskandar K · 2025Open reference 1 ↓}

Disease Associations#

PMDD/PMS: GABAergic deficiency implicated in premenstrual mood dysregulation; Allopregnanolone (a GABA-A receptor modulator) is central to PMDD pathophysiology.^{[2]Itriyeva 2022 — PMS and PMDD in Adolescents (Review)Khalida Itriyeva · 2022Open reference 2 ↓[3]Cheng 2025 — Neuroinflammation in PMS and PMDD (Review)Cheng et al. · 2025Open reference 3 ↓[4]Nexha 2024 — Biological Rhythms in PMS/PMDD (Systematic Review)Adile Nexha, Luisa Caropreso, Taiane de Azevedo Cardoso et al. · 2024Open reference 4 ↓}

Schizophrenia: Altered GABA levels and GABAergic signaling in schizophrenia gut-brain axis.^{[5]Functional Associations of the Gut Microbiome with Dopamine, Serotonin, and BDNF in Schizophrenia: A Pilot StudyGhorbani M, Joseph GBS, Tew MM et al. · 2024Open reference 5 ↓[6]The Gut Microbiome is Associated with Brain Structure and Function in SchizophreniaLi S, Song J, Ke P et al. · 2021Open reference 6 ↓}

MS: Dietary interventions targeting GABA pathways in multiple sclerosis.^{[7]Effects of Different Dietary Interventions in Multiple Sclerosis: A Systematic Review of Evidence from 2018 to 2022Atabilen B, Akdevelioglu Y · 2022Open reference 7 ↓}