L-Theanine

What Is L-Theanine?

L-theanine is an amino acid that tea plants make and almost nothing else does. The roots build it and the leaves hold it. In green tea it accounts for about half of the free amino acids present. It never gets folded into protein.

How It Works in the Body

Its shape is the whole story. L-theanine is a close structural cousin of glutamate, one of the brain's main signaling amino acids. That resemblance lets it cross from the blood into brain tissue and settle at the same sites glutamate uses. It is associated there with alpha-wave activity, the electrical rhythm of a brain that is awake and quiet rather than drowsy.

What It Supports

• A calm, balanced mood: Supports a settled frame of mind that does not tip into drowsiness.
• Alert attention: Supports the kind of focus you can hold while staying relaxed.
• Restful sleep: Supports winding down at the end of a long day.
• Glutamate signaling: Contributes to the messenger chemistry the brain already runs on.

Who It May Suit

People who drink green tea for how it makes them feel and would rather have that one part on its own. It suits anyone who pairs it with coffee. The capsule shell is plant-based, so it fits vegan and vegetarian patterns.

Good To Know

This is free-form L-theanine, the same form tea leaves hold, so nothing has to be converted first. Talk with your healthcare provider before use, especially if you take blood pressure medication or a sedative, because L-theanine may add to the effect of either.