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Beschreibung GABA tea may become one of the most promising natural allies against the pressures of modern civilization, from high blood pressure to chronic stress and irritability. For tea lovers, it offers something beyond capsules and supplements: a fragrant, golden, flavorful infusion that nourishes both body and mind. Although GABA has already become a massive part of the dietary supplement market, its mechanism of action is often described vaguely. I have read many capsule descriptions, yet most of them say only that GABA is an important amino acid, beneficial for the body, vegan, and pure. That did not tell me much. So, I decided to look deeper into why GABA tea might be good for us, aside from the fact that it tastes wonderful and I love it. What Is GABA and GABA Tea? GABA tea is a relatively new variety of tea with an exceptionally high content of GABA (γ-aminobutyric acid). A tea qualifies as GABA tea if the finished product (Camellia sinensis) contains more than 150 mg of GABA per 100 grams of tea. Our teas contain approximately 350 mg per 100 grams, which makes me very proud, even if I did not fully understand what that impressive number meant at first. GABA is a natural component of the nervous system and one of the brain’s principal inhibitory neurotransmitters. It gently regulates neural activity and, when excitatory signals become excessive, reduces neuronal firing. In this way, it prevents overstimulation, moderates stress, and restores calm. GABA is the body’s natural response to anxiety, seeking equilibrium within the nervous system. Source: GABA: Genetics, Anxiety, and Immune Response, January 13, 2025 by Debbie Moon, MScGenetic Lifehacks / Image of GABA release at the synaptic terminal of a GABAnergic inhibitory neuron. During GABA tea processing, the GABA content of the leaves increases. Within the tea leaf, GABA is formed naturally through metabolic processes, primarily from another amino acid, glutamate, which tea plants contain in higher concentrations than most vegetables. GABA tea is made by plucking the leaves, lightly tossing and withering them. During this time, cell wall permeability increases, the leaves lose water, their surfaces become slightly damaged, and fermentation begins. Then, the leaves are placed in a sealed, oxygen-free (anaerobic) environment, often a nitrogen-filled tank, and fermented for six to ten hours. Enzymes transform glutamate into GABA and carbon dioxide during this process. Source: Anna Wagner 2019 Alishan, Taiwan / withering oolong tea leaves Source: Anna Wagner 2023 Nantou, Taiwan / Tea producers ferment the fresh leaves in sealed, nitrogen-rich tanks Source: Anna Wagner 2023 Meishan, Taiwan / GABA oolong Source: Anna Wagner 2023 Meishan, Taiwan / Making GABA oolong – steps and machines Japan, Taiwan, and the Role of Great Tea GABA tea was discovered in 1987 by a team led by Dr. Tsushida at the Japanese National Food Research Institute. The group was initially experimenting with anaerobic preservation methods for fresh vegetables. When they analyzed the altered composition of green tea, they found that its GABA content had multiplied while glutamate, normally abundant in plant tissues, had almost disappeared. Japanese GABA tea later became widely available on the market and gained popularity as a healthy tea variety. After 1988, production increased rapidly, and as technology improved, the GABA content continued to rise. Today in Japan, biotechnological methods are used to produce high-GABA beverages that are also marketed as dietary supplements. Although GABA tea was invented in Japan, Taiwanese research centers refined the process and developed the complex multi-stage fermentation method used for GABA oolong teas, identifying the most suitable tea cultivars (TTES 12–13, Chin Shin Oolong, and Shi Ji Chun). The glutamate content of tea depends on the altitude of the garden, the harvest season, and the quality of the leaves. Spring harvests contain more amino acids than summer or autumn ones, and teas grown above 1,000 meters tend to have much higher amino acid levels. In other words, high-mountain spring leaves are the most valuable. Since stems also contain a large amount of glutamate, young spring shoots are always plucked together with their stems. Source: Anna Wagner 2023 Meishan, Taiwan / High Mountain Tea Plantation Source: Anna Wagner 2023 Meishan, Taiwan / Firs tasting of our GABA White tea at Mr Lin Source: Anna Wagner 2023 Meishan, Taiwan / Firs tasting of our GABA White tea at Mr Lin Source: Anna Wagner 2023 Meishan, Taiwan / Taiwan Tea processing machines Proven and Suggested Effects Current research and empirical observations show that GABA tea, when consumed orally, is absorbed through the digestive tract, enters the bloodstream, and becomes detectable in plasma within 30 to 60 minutes. This allows it to exert peripheral physiological effects, for instance, lowering blood pressure via GABA receptors in blood vessel walls, or improving heart rate variability (HRV) through autonomic regulation. The effect is not dramatic but steady, safe, and free from side effects. GABA does not replace medical treatment for hypertension but may serve as a useful complement in mild cases, and its benefits are measurable. Stress, anxiety, and insomnia are often associated with GABA deficiency or GABA receptor dysfunction in the central nervous system. Logically, taking GABA might enhance inhibitory tone and promote calm. This is an appealing physiological narrative, even though most evidence suggests that orally consumed GABA crosses the blood–brain barrier only minimally, if at all. Some experts therefore argue that its effects are indirect. Source: GABA: Genetics, Anxiety, and Immune Response, January 13, 2025 by Debbie Moon, MScGenetic Lifehacks / The role of GABA in the brain, the immune system response, autoimmune diseases, and more. Why People Still Feel a Calming Effect ? Several indirect mechanisms have been proposed. The gut contains an extensive neural network, sometimes called the “second brain” , with both GABA_A and GABA_B receptors. When GABA enters the gut, it activates these receptors, altering intestinal motility, hormone production, and even the activity of the vagus nerve. Signals through this nerve can reach the brain and induce relaxation or reduce stress responses indirectly. While there is limited clinical proof, a growing body of empirical evidence suggests that oral GABA reduces physiological and neurological stress responses. The effect appears probable though not conclusively proven, and the mechanism remains under debate. Small, short-term human trials have reported acute stress-reducing effects, EEG changes, and improved cardiovascular stress markers after GABA intake. These findings are encouraging, even if not yet strong enough for therapeutic recommendations. For now, GABA tea is considered a gentle aid for relaxation, a naturally balancing beverage rather than a medicine. Neural balance depends on the ratio between excitatory (glutamate) and inhibitory (GABA) activity. When GABA’s influence prevails, the brain slows down; neurons fire less frequently. When GABA activity is weak, overstimulation and anxiety increase. Modern medications don’t raise GABA levels directly but bind to GABA_A receptors to amplify natural GABA effects, thereby strengthening inhibition and producing calm. In the same spirit, GABA tea supports the natural balance of the nervous system. Personal Experience At the moment, two teas have an exceptionally positive effect on me and those around me, with minimal stimulating (caffeine) influence: ginseng oolong and GABA oolong. I wouldn’t describe the effect as sedative but rather as balancing, a kind of gentle desensitization that softens irritability and dulls background noise on a busy day. For me, the effect is immediate, though it seems to work only when I’m already slightly overstimulated. Of course, if someone suffers from clinical depression, it cannot replace medical treatment. Still, it’s a comfort to know that such a calm and stable state can be found in something as simple as tea. Recommended Reading Genetic Lifehacks: GABA Genetic Variants that Impact this Inhibitory NeurotransmitterPubMed Central: A Novel Theanine Complex, Mg-L-Theanine Improves Sleep Quality Research Background (Chronological Summary) 1955 – Professor Takahashi demonstrated GABA’s blood pressure–lowering effect. 1963 – Professor Stanton observed the same effect in rabbits, mice, and cats. 1960–1970 – David Curtis and Jeffrey Watkins identified GABA as an inhibitory neurotransmitter and proved its calming, neuroprotective, and antihypertensive roles. 1987 – Dr. Tsushida (Japan National Tea Research Institute) discovered how to produce GABA-rich tea. 1987–1988 – Professor Matsuura showed that consuming 3 grams of GABA tea per day (about 150 mg of GABA) noticeably reduced blood pressure. 1995 – Professor Yasuhiko confirmed these effects and published the findings in the American Journal of Hypertension. 1997–1998 – Professor Kawakami Shinya (Shizuoka Agricultural Experiment Station) developed a method that significantly increased GABA levels in “Jia Ye Long Cha.” 2000 – Professor Ōmori Masashi found that GABA tea not only lowers blood pressure but also protects kidney function and improves metabolism under high-salt diets. 2001 – The Chinese Academy of Agricultural Sciences and Japan’s Nara University showed that GABA tea inhibits the ACE enzyme, helping regulate blood pressure. 2001 – The Hunan Tea Research Institute and Hunan Provincial Hospital conducted a clinical trial with 50 hypertensive patients and confirmed improved blood pressure and general wellbeing. 2010 – Hyland & Cryan (Frontiers in Integrative Neuroscience) demonstrated that GABA modulates gut motility and vagus activity, suggesting its calming effect is reflexive or hormonal. 2019 – A study titled Effect of GABA-Fortified Oolong Tea on Reducing Stress (30 participants) found that a single dose of GABA-rich tea reduced subjective stress scores and improved HRV. 2020 – Effects of Oral GABA Administration on Stress and Sleep in Humans: A Systematic Review confirmed moderate evidence of stress reduction. 2024 – A study on sedentary overweight women found that GABA supplementation improved heart rate variability, emotional response, sleep efficiency, and reduced depression. 2025 – GABA Intake Improves Psychological State and Performance in Esports reported that e-sports players who received 200 mg of GABA showed reduced confusion and fatigue and improved performance. Together, these findings paint a picture of GABA tea as a quiet but effective ally, not a miracle drug, but a naturally balanced beverage whose benefits science continues to illuminate. Written by Anna Wagner / ITA International Tea Sommelier If you enjoyed this article and would like to experience the gentle effects of GABA tea yourself, you’re welcome to explore our selection at the Tea Bar: Organic Kawane Hikari Gaba Aocha | Japanese GABA Oolong Tea, Masui Tea Garden – 35g €17.00 In den Warenkorb legen Details Slightly Roasted Organic GABA Oolong | Plum, Hazelnut and Jujube Aroma €7.20 - €54.00Price range: €7.20 through €54.00 Optionen auswählen Dieses Produkt hat mehrere Varianten. Die Optionen können auf der Produktseite ausgewählt werden Einzelheiten Organic Formosa GABA Oolong | Nantou, Taiwan 2025, Gentle, Sweet, Stress-relief €7.20 - €54.00Price range: €7.20 through €54.00 Optionen auswählen Dieses Produkt hat mehrere Varianten. 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