Vegetarian L-Theanine Mood non-GMO Green tea Gluten-free Stress Amino Acids

Theanine XR™ Stress Relief

Extended-release of L-theanine to stay calm and collected all day long

Item #02429 30 Vegetarian Tablets 1 per serving In Stock
Vegetarian L-Theanine Mood non-GMO Green tea Gluten-free Stress Amino Acids

Theanine XR™ Stress Relief

Extended-release of L-theanine to stay calm and collected all day long

Item #02429 30 Vegetarian Tablets 1 per serving In Stock

For you, if you want a relaxed state of mind without drowsiness during the day

The L-theanine in Theanine XR™ Stress Relief can:
  • Encourage relaxation without making you sleepy
  • Help increase brain wave activity that can promote a state of wakeful rest
  • Support healthy response to daytime stress with extended-release technology

Are you seeking a way to manage daytime stress in a healthy way? Theanine XR™ Stress Relief can support a restful state of mind and help you maintain calm energy with a once-a-day formula.

€30.34 €30.34 Save
Buy 1
Buy 2
(5% off)
Buy 4
(10% off)
Free Shipping
on orders over € 69
Money Back Guarantee
We have a 100 days return policy, not the standard 30 days!
Daily Shipping
Order before 11:00 CET, for same day shipping (Mon-Fri)
Customer Care Advisory
We can help you in 6 languages
Product details "Theanine XR™ Stress Relief"
Health benefits at a glance:

First of all, what is L-theanine? It’s a naturally occurring amino acid that has been shown to support a healthy response to stress. (1)

Action-packed days demand a lot from our bodies. Over time, unmanaged stress can leave us feeling frazzled. (2) And most people are familiar with the notion “it’s just one of those days”.

Green tea is rich in L-theanine, and for many, drinking a freshly brewed cup of green tea can help soothe the mind when life is hectic. A green tea break isn’t always an option though, and that’s why Life Extension created Theanine XR™ Stress Relief.

Theanine XR™ Stress Relief can provide all-day stress support with extended-release technology, so you can stay calm and collected all day long — without drowsines.

Why it works:

Theanine XR™ Stress Relief formula provides 400 mg of green tea’s amino acid L-theanine over a six-hour period. This is to promote a prolonged state of wakeful relaxation and in that way helping the body manage daytime stress. (1,3)

L-theanine is shown to significantly increase brain wave activity that can help promote a state of wakeful rest. (4) It can also help decrease glutamate signaling, effectively calming the mind — even during those days where you feel you have too much on your plate. (1,3,6)

The science behind the product:

L-theanine and a relaxed mind

Studies indicate that L-theanine can cross the brain-blood barrier, positively affecting the brain’s pathways associated with mental relaxation and calmness. It has been shown to help protect brain areas associated with your stress response from oxidative stress. (4)

It can also help modulate the activity of excitatory neurotransmitters like glutamate and increase levels of GABA (5), another neurotransmitter that helps keep the mind calm and relaxed, especially when you’re having “one of those days.” (1,3,6)

Formula with extended-release of l-theanine

Your body metabolizes L-theanine quickly. You would need to drink several cups of green tea during the day or take multiple doses of regular L-theanine to maintain a steady supply of L-theanine, and green tea by itself contains very low levels of theanine.

Using an immediate- and extended-release technology, scientists have found a way to allow L-theanine to stay in the body for up to six hours

One study in moderately stressed adults found that a single dose of this form of L-theanine led to a greater increase in indicators of relaxation compared to placebo. (7)

This unique technology allow Theanine XR™ Stress Relief to provide a steady supply of the stress-modulating amino acid.  Each vegetarian tablet is gluten-free and non-GMO.

This supplement can be the perfect complement to your busy, modern lifestyle.

How to use:

Please take according to the dosage and use guidelines under supplement facts, or as recommended by a healthcare practitioner.

Health topics:
Supplement Facts

Serving size: 1 tablet
Servings per container: 30

Amount per day (1 tablet):%RI*
L-Theanine [as Theanine XR™]400 mg**

*RI = EU reference intake **No RI available


L-Theanine, bulking agents (calcium phosphates, microcrystalline cellulose/cellulose gel), glazing agent (hydroxypropylmethylcellulose), bulking agent (hydroxypropyl cellulose), anti-caking agents (fatty acids, silicon dioxide [nano], magnesium salts of fatty acids), bulking agent (cross-linked sodium carboxy methyl cellulose/cross linked cellulose gum), humectant (glycerol)



Take one (1) tablet daily.


  • Keep out of reach of children.
  • Do not exceed recommended daily dose.
  • Do not purchase if outer seal is broken or damaged.
  • Consult with your physician if you are undergoing treatment for a medical condition or if you are pregnant or lactating.
  • A food supplement should not be used as a substitute for a varied and balanced diet and a healthy lifestyle. 
  • Store tightly closed in a cool, dry place.

  1. Plant Foods for Human Nutrition. 2020;75(1):12-23.
  2. Sage Journals 2017
  3. J Clin Biochem Nutr. 2016;59(2):93-99.
  4. Brain Res. 2013;1503:24-32.
  5. J Herb Pharmacother. 2006;6(2):21-30.
  6. Asian Pacific Journal of Tropical Biomedicine 2017;7(9):842-848.
  7. Evans M, McDonald AC, Xiong L, et al. A Randomized, Triple-Blind, Placebo-Controlled, Crossover Study to Investigate the Efficacy of a Single Dose of AlphaWave((R)) L-Theanine on Stress in a Healthy Adult Population. Neurol Ther. 2021 Dec;10(2):1061-78.

Original source/product from Life Extension®