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Thorne Research, Theanine, 90 Veggie Caps

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In Stock
  • Expiration Date: Apr 2018
  • Shipping Weight: 0.15 lbs (0.07 kg)
  • Product Code: THR-50801
  • UPC Code: 693749508014
  • Package Quantity: 90 Veggie Caps
  • Dimensions: 2 x 2 x 3.8 in, 0.1 lbs (0.05 kg)
Bundle Offer
Save $4.00 when you purchase these items today for only $60.60
Total: $64.60
Combo Discount: - $4.00
Together: $60.60

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Product Overview


  • Dietary Supplement
  • Hypoallergenic

L-theanine is a unique amino acid present almost exclusively in the tea plant (Camellia sinensis) and used safely in Japan for decades. L-theanine has demonstrated the potential to positively modify brain waves and key neurotransmitters involved in mood, focus, and memory. Consumption of L-theanine enhances brain alpha-wave activity, a sign of relaxation. The intensity of brain alpha-wave activity increases within 30-45 minutes of L-theanine supplementation, promoting relaxation, mental focus, and acuity.

This effect is most pronounced in persons subjectively feeling the highest levels of distress. A small Japanese study of university students showed 200 mg oral L-theanine led to increased brain alpha-waves and a subjective sense of relaxation. Theanine administration caused a dose-dependent relaxed, yet alert, state of mind without sedation, beginning approximately 40 minutes after oral dosing. L-theanine can enhance the production of the neurotransmitters dopamine and serotonin and appears to play a role in the formation of GABA – a neurotransmitter that acts like a "brake" during times of runaway stress. Theanine helps establish balance in the neurotransmitter system, resulting in improvements in the mental/emotional and physical disturbances resulting from being overly stressed.

Suggested Use

Take 1 capsule one to three times daily or as recommended by your health-care practitioner.

Other Ingredients

Hypromellose (derived from cellulose) capsule, microcrystalline cellulose, leucine, silicon dioxide.


Tamper Evident: Use only if bottle is sealed.

If pregnant, consult your health-care practitioner before using this product.

Store tightly sealed in a cool, dry place.

Supplement Facts
Serving Size: One Capsule
Each Capsule Contains: Amount Per Serving % DV
L-Theanine 200 mg *
*Daily Value (DV) not established
iHerb Customer Reviews

The best sleep in ages

Posted by 5748667346441339005 on May 12, 2015

Very effective. Sleep has been less interrupted and more refreshing

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Helps me sleep!

Posted by 4625915390168235560 on Jan 13, 2015

Helps me sleep!

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Makes me sleepy

Posted by Reviewer2624333 on Jan 29, 2014

I take 2 at bedtime, because it makes me sleepy. I have tried the Thorne PharmaGaba, but it had no effect, even at 4 capsules a night. L-Theanine is not suppose to make people sleepy, and PharmaGaba IS supposed to make people sleepy. In my case I find the opposite to be true. I don't know why. Both are suppose to relax us. This helps me go to sleep, and stay asleep, so be aware of that if this is not the effect you want.

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Posted by naebob on Sep 13, 2013

I was given these by my naturopath, they really helped me with anxiety along with 5-htp

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Posted by Reviewer1559362 on Nov 22, 2009

Made me sleepy and didn't reduce my pain level.

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