A study published in the journal Nutrients concluded that GABA tea is a promising candidate that can be used as an adjuvant in the treatment of PSD (Post Stroke Depression).
The antioxidant activity of GGABA and OGABA was assessed by determining the levels of lipid peroxidation products and the activity of antioxidant enzymes in mouse brains.
Here you have the reference and a link to the full text of the article:
https://www.mdpi.com/2072-6643/9/5/446/pdf?version=1493946623