L Theanine and Tea: What You Need to Know

If you’re a tea drinker, you’re probably familiar with the soothing feeling that accompanies a good cup of tea - and now this calming, stress-reducing effect is backed by science! Research shows that tea made from the camellia sinensis plant contains l-theanine, a beneficial compound that helps to reduce anxiety and promote relaxation and wellbeing.

L-theanine is found primarily in tea, as well as in some types of mushrooms. While l-theanine is also available in supplement form, you can reap just as many benefits with an ordinary cup of tea!


What is L-Theanine?

Studies show that l-theanine can help to reduce feelings of stress and anxiety. L-theanine works by blocking excitatory neurotransmitters like glutamate, resulting in feelings of calm and relaxation. L-theanine also stimulates a related neurotransmitter called GABA, which produces its own calming, anxiety-reducing effects. Unlike compounds with similar properties, l-theanine doesn’t contribute to drowsiness or a lack of alertness. Instead, the l-theanine present in tea provides a soothing, calming effect without making you feel sleepy!

L-Theanine in Tea

Aside from its potent stress-reducing effects, l-theanine is also responsible for the umami taste in tea. This savory-sweet characteristic gives tea a rich depth of flavor in addition to its unique health benefits. While l-theanine is present in all loose leaf tea made from the camellia sinensis plant, certain teas like matcha, shade-grown green teas, and first flush teas contain particularly high levels of l-theanine. Factors that can influence the l-theanine content in tea include:

  • Growing practices - Shade-grown Japanese teas tend to be especially high in l-theanine. This includes shaded full leaf teas like Gyokuro and Kabusecha as well as Matcha, which is a form of powdered shade-grown green tea. The shading process induces a stress response in the tea plant, resulting in elevated levels of l-theanine, caffeine, and other beneficial properties.

  • Processing methods - L-theanine may be better-preserved in teas that undergo minimal processing. This includes minimally processed green teas and white teas. However, research concerning the effect of tea processing methods on l-theanine levels is still ongoing, with some studies demonstrating conflicting evidence.

  • Harvest time - Teas that are harvested early in the spring, including first flush teas and silver needle teas, tend to be higher in l-theanine.

Without access to precise scientific tools, it can be difficult to accurately measure the l-theanine content in a particular tea. One hint that a tea may be high in l-theanine is if it has a distinct umami-like flavor. While studies indicate that some types of tea contain slightly more l-theanine, all types of tea made from the camellia sinensis plant contain some l-theanine, making whatever cup of tea you fancy a healthful choice, including black, white, oolong, and purple tea. Herbal teas won’t contain any l-theanine, since they’re not made from the camellia sinensis tea plant.

Tea and Mindfulness

While scientific research has only recently caught up, tea has been used to reduce stress, promote wellbeing, and enhance cognitive function for hundreds of years. Tea is an important component of ceremonies, rituals, and religious practices all over the world, from the matcha-based Japanese tea ceremony to the Gongfu tea ceremony in China and everywhere in between. These unique traditions are often hundreds of years old, and have been perfected over the course of centuries. Tea ceremonies force participants to slow down and engage with the world in a mindful, meditative manner.

Tea preparation and consumption is also especially associated with meditation and mindfulness in Buddhist religious practice. Tea was first incorporated into religious rituals during the Tang dynasty, and became closely associated with temples and monasteries. The l-theanine and caffeine present in tea are thought to aid in mindfulness and meditation by helping to induce a calm, alert state that combines stimulation and relaxation.

Other Benefits of L-Theanine

In addition to its use as an aid for stress-relief and relaxation, l-theanine has been shown to have a variety of related benefits. While l-theanine doesn’t contribute to drowsiness or lack of focus, it can be used as an effective sleep aid to help promote deep, high quality rest. L-theanine also has other beneficial effects including boosting the immune system, reducing blood pressure, and even warding off certain types of cancer. When combined with caffeine in a cup of tea, l-theanine has been shown to promote focus and clarity, making it a great study aid. The combination of caffeine and l-theanine helps to promote cognitive function and increase alertness and attention.

No matter what kind of tea you enjoy, drinking tea can be especially beneficial for stress relief, and can be a welcome moment of calm in an otherwise hectic day. Both scientific research and personal experience suggest that a cup of tea can be a great way to unwind, relax, and destress. Next time you’re feeling overwhelmed by life, take a moment to brew up a cup, and enjoy!

Teas That Are High in L-Theanine

Some teas that are particularly high in l-theanine include:

1. Gyokuro Green Tea

Gyokuro is a premium shade-grown tea produced in Japan. This tea is highly prized by dedicated tea drinkers, and brews up a beautiful emerald color with a rich, almost oceanic flavor and a full body. Gyokuro is shade grown for up to three weeks prior to harvest, which contributes to the high l-theanine levels of this unique tea.

2. Kabusecha Green Tea

Like Gyokuro, Kabusecha is another shade-grown Japanese green tea that’s high in l-theanine. Kabusecha is shaded for a slightly shorter period of time than Gyokuro, typically about two weeks. It has a slightly lighter body than Gyokuro, but shares the prized savory-sweet umami quality.

3. Himalayan Spring White Tea

Himalayan Spring is a premium white tea grown in Nepal. This tea is a first flush harvested early in the spring season, and is high in l-theanine and other beneficial properties. It has a light, delicate taste, with notes of stone fruit.

4. Monteviot First Flush Darjeeling Black Tea

Our Monteviot First Flush Darjeeling is an exceptional first flush Indian black tea. This tea is lighter and subtler than a traditional second flush Darjeeling, with floral notes and an astringent bite. First flush Darjeelings are often nicknamed “the champagne of teas” for their extremely high quality.

5. Matcha

In addition to loose leaf tea, l-theanine is also found in matcha, a powdered green from Japan with an umami-packed flavor. Since matcha is made from the whole leaves of tea plants ground into a fine, bright green powder, it contains more concentrated levels of everything that makes tea so healthful, including l-theanine. If you’re not in the mood for a traditional bowl of matcha, you can also add culinary grade matcha to smoothies, lattes, and more.


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