They also reported a trend for reduced changes for beta waves in GABA vs. water condition. The only 4 week-long interventional study utilizing biosynthetic GABA observed an increase in cortisol levels in the placebo group after 2 and 4 weeks of GABA use, but GABA group did not show such an increase (Yamatsu et al., 2013).
GABA (Gamma-aminobutyric acid) is a neurotransmitter that has a calming effect on the nervous system. It's used as a supplement to support stress relief, PMS relief, sleep, mood, focus fat-burning, lean muscle-building, and blood pressure issues, according to WebMD.. Now, a new study published in the journal Cell Reports indicates that the calming effect of GABA can sometimes backfire.
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