What is L-theanine?
L-theanine is an amino acid found mainly in tea. It is structurally similar to glutamate and glutamine. Your body does not use it to build proteins, unlike many other amino acids.
NOW Foods
L-Theanine 200mg Double Strength | 120 Capsules | NOW Foods
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120 capsules
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120
L-Theanine 200mg by NOW Foods
If you like drinking green tea, you have probably already had it before: L-theanine. This amino acid gives tea part of its mild, savory flavor. NOW Foods offers it here in double strength, with 200mg of L-theanine per capsule, supplemented with 100mg of inositol. The bottle contains 120 plant-based capsules, enough for four months at one capsule per day.
What L-theanine actually is
L-theanine is an amino acid that is found almost exclusively in the tea plant (Camellia sinensis) and in a few mushrooms. It is not a building block for proteins, like most amino acids you know. Chemically, it resembles glutamate and glutamine. A cup of green tea contains about 8 to 30mg of L-theanine, depending on the type and how long you let it steep. Shade-grown teas such as matcha and gyokuro clearly contain more, because the plant converts less theanine into bitter substances without sunlight. To get 200mg, you would therefore have to drink ten cups of tea quite quickly. And you would also get a large dose of caffeine with it.
How your body processes L-theanine
After swallowing, your small intestine absorbs L-theanine via the same transport proteins that also bring in other amino acids. Within about half an hour to an hour, it can be detected in your blood. After a few hours, your body breaks it down into ethylamine and glutamic acid, which you then excrete through your kidneys. Many people wonder whether you should take it on an empty stomach. NOW does indeed recommend this, because other amino acids from your meal will not compete for the same transport proteins.
Why inositol is included
Inositol is a sugar-like substance that your body makes itself from glucose. It used to be called vitamin B8, but because your body makes it itself, it is no longer an official vitamin. You can find it in citrus fruits, beans, nuts, and whole grains. In your cells, inositol is a building block of phospholipids in the cell membranes, and it plays a role as a second messenger. That is a substance that transmits a signal from outside the cell to the inside of the cell. NOW combines the 200mg of theanine with 100mg of inositol.
In short: this is a concentrated form of the amino acid from tea, without the caffeine and without the ten cups. By the way, the Japanese researcher Sakato isolated L-theanine back in 1949 from the leaves of gyokuro, one of the most expensive Japanese tea varieties. In Japan, it is even added as an ingredient to beverages and candy. These capsules are plant-based, and the L-theanine is produced in China, after which NOW tests and processes it in the United States.
Why L-Theanine 200mg Double Strength from NOW Foods?
200mg L-theanine, double strength
Many L-theanine supplements contain 100mg per capsule. This variant from NOW gives you double, so one capsule is enough.
With 100mg of inositol per capsule
NOW combines theanine with inositol, a substance your body also produces itself.
Caffeine-free theanine
You get the amount of L-theanine found in about ten cups of green tea, without the caffeine that comes with it. Convenient if you want to take it later in the day.
A four-month supply in one jar
The jar contains 120 capsules. At one capsule per day, it lasts four months; at two per day, it lasts two months.
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* Percentage van de referentie inname volgens Verordening (EU) Nr. 1169/2011.
** Reference intake unknown.
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Frequently Asked Questions
How much L-theanine per day?
NOW recommends one capsule, once or twice a day. That is 200 to 400mg of L-theanine per day. Do not exceed the recommended daily dose.
When is the best time to take L-theanine?
It is recommended to take it on an empty stomach. L-theanine uses the same transport proteins in your intestine as other amino acids from your diet. Without a meal, there is less competition. You choose the time yourself, as needed.
Can you combine L-theanine with coffee?
Yes, you can. If you take medication, such as blood pressure medication or drugs that affect your nervous system, consult your doctor first.
What is inositol and why is it in there?
Inositol is a substance that your body produces itself from glucose. It is a building block of your cell membranes and acts as a second messenger: it transmits signals from the outside to the inside of a cell. NOW adds 100mg as a supplement to the theanine.
What is the difference between L-theanine and Suntheanine?
Suntheanine is a brand name for L-theanine that is produced through fermentation and consists purely of the L-form. Chemically, it is the same amino acid. The difference lies in the production method and the brand, not in the substance itself.