“Amazed at how different I feel. Energized & motivated!”


Your Cart is Empty

L-THEANINE 200, 60 capsules

Qty Discount
Buy 3 3% Off
Buy 5 5% Off
Free Shipping On Orders over $50
Nutritionist Approved
60-Day Return Guarantee


L-Theanine is a naturally occurring amino acid found in green tea leaves. It has been found to promote relaxation without drowsiness, easing nervousness due to overwork and fatigue, and support calmness.


Serving Size: 1 Capsule
Servings per container: 60
Pill Size:  #1 Veggie Cap


Ingredient Amount Daily Value
L-Theanine 200 mg **

Other Ingredients: Hypromellose, microcrystalline cellulose, vegetable magnesium stearate, silica.

Gluten Free | Dairy Free | Non-GMO | Vegetarian | Vegan

All NutriKey brand supplements are Pharmaceutical Grade and produced in Certified GMP (cGMP) facilities. All NutriKey brand supplements meet or exceed cGMP standards and are third party tested.


Recommendations: Take 1 to 2 capsules twice daily, or as directed by your healthcare practitioner.

Caution: If you are pregnant, nursing, or taking medication, consult your healthcare practitioner before using.



Thanks to its high bioavailability and simple uptake into the brain, supplementation with L-theanine has been shown to be effective for inducing a variety of psychologically beneficial properties, including stress support (relaxation) and promotion of cognitive function.

Research also suggests that L-theanine administration significantly increases alpha waves in the brain, without decreasing beta waves, thereby inducing relaxation without sedation. Alpha waves are one of the two most frequent types of waves produced in the brain when we are awake, with the other being beta waves.

People who are in a resting state or coming down from a busy set of activities are often in the alpha brain wave space. People who practice light meditation will also be functioning in the alpha brain level.

When we are highly involved, active, or engaged in difficult mental activities your brain waves are functioning at the beta level. Thus, when L-theanine is ingested, users tend to feel more calm but yet attentive.


These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.

Customer Reviews

Based on 11 reviews
Barry P.
It really works

Since I have been taking this L-theanine & magnesium my sleep has improved.

Wendy D.
Love this product

I started taking a L- Theanine at night with magnesium Glycinate
I have been sleeping so much better. It really helps.

Laura B.B.

Helps me calm down at night to sleep soundly.

Roxanne M.
Better sleep!

After taking L-Theanine along with magnesium before bed, my deep sleep has improved considerably. I’m also able to get back to sleep quick if I happen to wake up in the night. I also feel more rested when I wake up in the morning.

Debbie W.
Relaxes Me!

Started taking L-Theanine (200 mg/night) before bed, along with 50 mg of Trazadone & I fall asleep pretty well now & can sleep a bit longer than I did in the past. This is what was said about it: "L-theanine also increases alpha brain waves, which are associated with a state of relaxation. As a result, taking L-theanine supplements can lead to reduced stress and anxiety, improved sleep, and an overall sense of calm and well-being." Sure has made a difference for me. I had some slight stomach upset at first, with green bowel movements, but that has subsided, luckily within a short amount of time. Going more natural is the way to go. I hope to reduce the Trazadone over time as well, when the time is right.