Sebastian Freidank - 26. March 20

How L-Theanine sharpens your senses

Would you like to be more concentrated, focused and always 100% on task in your everyday life? And still stay relaxed? L-Theanine can help you.

Unfortunately, this rare and absolutely natural active ingredient is still hardly known. Wrongly so, because L-theanine has many positive properties that can make your day easier. One speaks of a relaxed vigilance, of shorter recovery phases after sport and a higher resistance to stress. Especially in combination with caffeine, a sustained performance-enhancing effect is described.

What is L-Theanine?

L-Theanine is an amino acid. All sorts of positive and health-promoting properties have been proven in a wide variety of studies. It acts on the central nervous system, thereby reducing mental and physical stress reactions. 1 

Where is L-theanine found?

So far, L-theanine has only been found in two plants and one fungus. It is therefore an active ingredient that is very rarely found naturally.

  1. L-theanine was the first active ingredient found in Camellia sinensis. Camellia sinensis is also known as "tea plant". All green, black, white and red teas come from the same plant and get their flavor from different fermentation processes.
  2. The chestnut mushroom ( Xerocomus badius ) is a popular edible mushroom. Small amounts of L-theanine were also found in it. 1
  3. The second plant in which L-theanine has been found is the guayusa plant (Ilex guayusa), a holly family.

L-theanine for stress management

Relaxed by L-Theanine

L-theanine is said to have a calming effect. It lowers blood pressure and influences the concentration of various messenger substances in the brain. It has a relaxing effect without making you sleepy. Experiments showed that the alpha waves in the brain were increased in subjects after taking L-theanine. These alpha waves ensure a slight relaxation or relaxed alertness. This way you can deal with upcoming tasks much more effectively and creatively. 1

After sport for faster regeneration

Since L-theanine reduces stress, it has been found that recovery phases during exercise are shorter. Sport generally puts the body in a state of stress and causes the muscles to become acidic. Muscles recover faster due to faster stress reduction with L-Theanine. 1

Caffeine and L-Theanine

Caffeine is a useful helper for particularly hard days. But one effect that occurs particularly when consuming coffee and conventional energy drinks is the well-known racing heart and lack of concentration. Caused by the rapid absorption of caffeine.

This usually only occurs when caffeine is consumed in isolation, such as with coffee, mate, or conventional energy drinks.

The combination of caffeine and amino acids, such as L-theanine, naturally found in guayusa works wonders. By binding the two substances, the caffeine is released in a more regulated manner. Your concentration increases constantly, the caffeine boost builds up evenly and your body and mind stay awake for a long time. 2

The levels of caffeine and L-theanine in Guayusa are naturally perfectly balanced. You can find more about L-theanine and caffeine in the article: "More mental and physical energy - L-theanine & caffeine as healthy boosters"

Curious? Order GUYA Guayusa now in our online shop, on Amazon or find GUYA near you on our store locator.


1 Federal Institute for Risk Assessment (BfR) - Beverages with isolated L-theanine


Guayusa tea

Organic Guayusa from GUYA is original Guayusa from Ecuador. You can order our Guayusa directly from our shop and have it delivered to your home.

GUYA is Europe's first and largest Guayusa brand that offers you a large selection of Guayusa products. Our versatile Guayusa blends bring variety to your everyday life, keep you awake, focused and relaxed at the same time.

Since 2016 we have been working directly with farmers from Ecuador without intermediaries and have learned a lot about the processing of guayusa.

We look forward to your Guayusa order. 

Powder Guayusa

Buy pure guayusa tea powder. Our Guayusa powder offers you a variety of preparations without losing the organic quality.

Our PURE Guayusa Powder is original Guayusa, but particularly finely sieved to extract the powder particles . You can use the Guayusa powder in preparation of  a latte, cappuccino, espresso or for smoothies and pastries.

With the use of our Dripper , Guayusa powder can easily be used to prepare tea. The dripper's has a double-walled sieve that prevents the powder particles from getting into your tea. This way you can enjoy a delicious Guayusa tea without tea leaves in the water.


The Guayusa sets contain all our Guayusa tea flavours  as well as our tea accessories.Purchasing Guayusa in Sets is a best way to save money because  the Guayusa is in cheaper price in Sets than when sold as an individual product.

Our Guayusa comes from Ecuador and is organically grown there and traded fairly by us.

Each Guayusa set is put together differently and offers you a cheap alternative to expensive individual orders. Choose from sets with a teapot, tea glass, thermos flask, tea strainer and our 7 Guayusa varieties.


Our high-quality tea accessories made from stainless steel and special borosilicate glass have a long service life and can withstand all temperatures unconditionally! Find the right tea accessory for you in our online shop!

The glass products, as well as our stainless steel tea strainers, are suitable for any loose tea. All products can easily be cleaned in the dishwasher or under running water.

You can buy our products individually or in a combined package at a lower price.

Our tea accessories online shop also offers you a large selection of Guayusa tea which all together, as a set, make   an excellent gift.

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