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Probiotics (living agents) & Anxiety / Anxiety Disorder

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Although direct oral consumption of 4-Aminobutyric acid / GABA can treat Anxiety / Anxiety Disorder (Hepsomali et al. 2020 Frontiers in Neuroscience 14: 923), probiotics containing strains that naturally produce GABA within the human gut are not currently used in anxiety treatment.
Grant et al. 2025 Benef Microbes Apr 24: 1-12 doi: 10.1163/18762891-bja00073

There is no significant correlation between probiotics and anxiety and depression levels in cancer patients. …