1 new from £28.38

Swanson Ultra Suntheanine L-Theanine (200mg, 60 Vegetarian Capsules)

3.9 out of 5 stars 11 customer reviews

Available from these sellers.
1 new from £28.38
  • Double potency L-Theanine supplement.
  • Delivers 200 mg per capsule, an important amount supported by clinical research.
  • Promotes calm, balanced mental health and emotional well-being.
  • 200mg, 60 Vegetarian Capsules

Special Offers and Product Promotions


Important Information

Legal Disclaimer
Unless expressly indicated in the product description, Amazon.co.uk is not the manufacturer of the products sold on our website. While we work to ensure that product information on our website is correct, manufacturers may alter their product information. Actual product packaging and materials may contain more and/or different information than shown on our website. You should always read the labels, warnings and instructions provided with the product before using or consuming it and not solely rely on the information presented on our website. If you have any specific product queries, please contact the manufacturer. This notice does not affect your legal rights.

Product Description

Research indicates that Suntheanine stimulates alpha wave activity in the brain, which is associated with calm alertness. Swanson's new Double Potency Suntheanine L-Theanine delivers 200mg per capsule, the upper limit shown to produce results in clinical research.


Product Information

Weight45 Grams
Storage InstructionsStore in a cool, dry place and out of direct sunlight.
Use By RecommendationAll Swanson products are marked with a manufacture date (MFG) and are considered fully potent for two years from the stated date. Exceptions to this are liquid supplements and probiotics which are considered stable for one year from the MFG date.
BrandSwanson
FormatCapsules
  
Additional Information
ASINB00DECMJL4
Best Sellers Rank 48,744 in Health & Personal Care (See top 100)
Shipping Weight141 g
Delivery Destinations:Visit the Delivery Destinations Help page to see where this item can be delivered.
Date First Available14 Oct. 2013
  
 


Customer Questions & Answers

Customer Reviews

3.9 out of 5 stars
Share your thoughts with other customers

Top Customer Reviews

Verified Purchase
I bought this because of the following reasons:
1. It is, according to SOME research, an NMDA receptor agonist.
2. It is claimed to have positive effects on its own and when used in conjunction with caffeine.
As for its NMDA receptor agonism, some research claims that it is an agonist while other research claims that it is an antagonist.

I have noticed the following things while using it:
1. In dosages of up to 400mg, it is sedating and causes drowsiness as seen when supplementing with high amounts of glutamine.
2. It can cause a slight sharpening of the senses but this is very minor.
3. It doesn't seem to do anything specific when coupled with caffeine. Taking caffeine with theanine is on par with taking cocaine when drinking green tea (theanine is in green tea). Any strong effect felt is obviously the cocaine at play. I truly doubt that there is any chemical synergy between theanine and caffeine.
4. It MAY cause a slight case of anxiety but don't take this too seriously; it may just be placebo.

I had to pay toll on this product which was almost the identical price of the product itself; thus I had to pay DOUBLE the product's price to receive it.
I don't understand why this is the case since it is legal to import into my country and and the toll seems bizarre--it's the first time I've ever had to pay a toll and I've purchased 100s of supplements on Amazon.
Comment 3 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
Thank you for your feedback.
Sorry, we failed to record your vote. Please try again
Report abuse
Verified Purchase
I'd thoroughly researched this product before buying it. Apparently sun theanine is better than just straight theanine, something to do with the way it's processed. It arrived promptly which was good because I was so looking forward to it as a way of combating my anxiety which seems to have gotten out of control lately. .. Anyway. . Nearly tore the postman's arm off so eager was i to crack open the bottle and start feeling normal again. Took my first capsule and waited for the calm feelings to envelope me. ... waited and waited. .. and waited some more. Nothing. Hmm. Decided that maybe I needed I stronger dose so took another capsule. Again nothing. What I have noticed though I'd if taken at bed time I do sleep through the night but if I'd wanted a sleeping aide I could have chosen from any number of over the counter products at a fraction of the cost. Not sure if it's this brand in particular because I did try viridian theanine and lemonbalm prior to this with some success. ..I say some because it only worked the first couple of times I used it (which is why i went for the suntheanine) so here's my advice ...... Anyone suffering with anxiety, brain fog, poor concentration, memory problems, lack of energy and no motivation should try adaptogens. They are seriously the best thing ever. Rhodilo and aswahangda are my favorites and they work almost instantly. .. within about 20 minutes. They work by adapting to any stress you have and balance you out. I will go as far as to say THEY HAVE LITERALLY CHANGED MY LIFE. Only thing is...I took them for too long so they have stopped working on me, apparently you should have breaks inbetween... Say one week on and a few days off or one month on and a week off. Wish I knew that then. .. Wouldn't be suffering now. .... Still though...Read more ›
4 Comments 10 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
Thank you for your feedback.
Sorry, we failed to record your vote. Please try again
Report abuse
Verified Purchase
I occasionally suffer from mild anxiety and/or irritability and restlessness (mostly caused by working a boring office job). L-Teanine has proven it's self a reliable relief, taking the edge off and just brining a feeling of contentment (party due to its ability to increases Alpha brainwaves . I sometimes take it on an empty stomach in the morning, or as-and-when-needed during times of anxiety and most of the time I notice it works pretty quickly.

On further research I have read that 'Suntheanine' is no more effective than regular L-Teanine, so will be trying another most cost effective brand next time.
Comment Was this review helpful to you? Yes No Sending feedback...
Thank you for your feedback.
Sorry, we failed to record your vote. Please try again
Report abuse
Verified Purchase
The other Swanson L-Theanine I used to get is no longer available, this stuff is just as good though.
Comment One person found this helpful. Was this review helpful to you? Yes No Sending feedback...
Thank you for your feedback.
Sorry, we failed to record your vote. Please try again
Report abuse
By HB on 2 Mar. 2015
Verified Purchase
Great supplement, seems slightly stronger than regular L-theanine but probably placebo.
Comment One person found this helpful. Was this review helpful to you? Yes No Sending feedback...
Thank you for your feedback.
Sorry, we failed to record your vote. Please try again
Report abuse
Verified Purchase
This brand and strength seems to do the trick better than other cheaper brands
Comment Was this review helpful to you? Yes No Sending feedback...
Thank you for your feedback.
Sorry, we failed to record your vote. Please try again
Report abuse


Amazon EU S.a.r.l. is certified organic according to EU Organic Food regulations by the control body LU-BIO-04
Disclaimer: While we work to ensure that product information on our website is correct, on occasion manufacturers may alter their ingredient lists. Actual product packaging and materials may contain more and/or different information than that shown on our website. All information about the products on our website is provided for information purposes only. We recommend that you do not solely rely on the information presented on our website. Please always read the labels, warnings, and directions provided with the product before using or consuming a product. In the event of any safety concerns or for any other information about a product please carefully read any instructions provided on the label or packaging and contact the manufacturer. Content on this site is not intended to substitute for advice given by medical practitioner, pharmacist, or other licensed health-care professional. Contact your health-care provider immediately if you suspect that you have a medical problem. Information and statements about products are not intended to be used to diagnose, treat, cure, or prevent any disease or health condition. Amazon.co.uk accepts no liability for inaccuracies or misstatements about products by manufacturers or other third parties. This does not affect your statutory rights.