Note: This document contains side effect information about tamsulosin. Oral intake of gamma-aminobutyric acid affects mood and activities of central nervous system during stressed condition induced by mental tasks. Anti-hypertensive effect of gamma-aminobutyric acid (GABA)-rich chlorella on high-normal blood pressure and borderline hypertension in placebo-controlled double blind study. Psychological stress-reducing effect of chocolate enriched with gamma-aminobutyric acid (GABA) in humans: Assessment of tress using heart rate variability and salivary chromogranin A. Relieving occupational fatigue by consumption of a beverage containing gamma-amino butyric acid. Blood-pressure-lowering effect of a novel fermented milk containing gamma-aminobutyric acid (GABA) in mild hypertensives. Gamma-aminobutyric acid as a bioactive compound in foods: a review. Safety and efficacy of gamma-aminobutyric acid from fermented rice germ in patients with insomnia symptoms: A randomized double-blind trial. Neurotransmitters as food supplements: The effects of GABA on brain and behavior. Relaxation and immunity enhancement effects of gamma-aminobutyric acid (GABA) administration in humans. You can learn more about how we ensure our content is accurate and current by reading our editorial policy. Healthline has strict sourcing guidelines and relies on peer-reviewed studies, academic research institutions, and medical associations. Larger, more long-term studies are needed to fully understand the benefits of GABA supplements. But most of these studies were very small and many are out of date.
The results of all of these studies sound promising. In another study, taking capsules containing 100 mg of GABA reduced measures of stress in people completing an experimental mental task. But the beverage containing 50 mg appeared to be slightly more effective.Īnother study from 2009 found that eating chocolate containing 28 mg of GABA reduced stress in participants performing a problem-solving task. Both beverages were linked to reduced measures of mental and physical fatigue while doing a problem-solving task. Stress and fatigueĪ 2011 study in Japan examined the effects of a beverage containing either 25 mg or 50 mg of GABA on 30 participants. Like many other studies looking at the effects of GABA supplements in humans, this study was very small, with only 40 participants. They also reported improved sleep quality four weeks after starting treatment. In a small 2018 study, participants who took 300 milligrams (mg) of GABA an hour before going to bed fell asleep faster than those taking a placebo. This was compared with a placebo.Ī 2009 study found that taking a GABA-containing Chlorella supplement twice a day reduced blood pressure in those with borderline hypertension. In one study from 2003, daily consumption of a fermented milk product that contained GABA reduced blood pressure in people with slighted elevated blood pressure after two to four weeks. Some small, older studies have evaluated the use of GABA-containing products for lowering blood pressure. The article also notes that the relaxing effects were felt within an hour of taking the supplement. AnxietyĪccording to a 2006 article, two very small studies found that participants who took a GABA supplement had increased feelings of relaxation during a stressful event than those who took a placebo or L-theanine, another popular supplement. Here’s a look at some of the research behind GABA’s more popular uses.
But some research suggests that it’s only small amounts. In fact, experts don’t know how much GABA actually reaches the brain when consumed as a supplement or food. Not much is known about the effectiveness of GABA supplements.
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