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Item: SWU110
4.8 out of 5 (127)

Swanson Ultra

Suntheanine L-Theanine

Suntheanine L-Theanine

  • Suntheanine L-Theanine works gently and naturally to promote relaxation without drowsiness

  • Enhances endocrine function, stimulating some brain waves and leaving others unaffected

  • A unique amino acid derived from green tea leaves

100 mg 60 Veg Caps
Veg Caps Size: 1

Retail $13.99
Save 43%
In Stock
  • Suntheanine L-Theanine works gently and naturally to promote relaxation without drowsiness

  • Enhances endocrine function, stimulating some brain waves and leaving others unaffected

  • A unique amino acid derived from green tea leaves

Get the most out of your life by de-stressing naturally with L-theanine! This unique amino acid has been extensively researched and shown to promote relaxation without causing drowsiness. It works by enhancing endocrine function, stimulating specific brain waves without inhibiting others. Swanson Ultra, featuring patented SunTheanine, offers a safe and effective alternative to help you keep up the pace with a smile on your face!

Terms and Ingredient Definitions

Supplement Facts

Serving Size 1 Veggie Capsule

  Amount Per Serving % Daily Value
Suntheanine® L-Theanine 100 mg *

*Daily Value not established.

Other ingredients: Brown rice flour, hypromellose (vegetable capsule), magnesium stearate.

Suggested Use: As a dietary supplement, take one veggie capsule one to two times per day with water before meals.

Suntheanine® is a registered trademark of Taiyo International, Inc.

Relative Size

Printable Pill Size Guide

Shipping Weight

.11 lbs

Summary of Customer Ratings & Reviews

Customer Ratings & Reviews

Rated 4.8 out of 5 by 127 reviewers.
Rated 4 out of 5 by theanine I have a busy brain which is hard to turn off at the end of the day, I use this amino to shorten the time it takes to go to sleep after a hectic day, I find nothing will work 100% for me always but this has a better average than many things I have tried in the past March 7, 2016
Rated 5 out of 5 by wonderful product This product is great, it helps me not to be to anxious and it's natural, the price is a lot lower when I buy online than at any store November 16, 2015
Rated 5 out of 5 by Great price, great product! It works very well for my mother and myself and we've been using it for over a year now. October 12, 2015
Rated 5 out of 5 by great stuff Suntheanine is the pure version of theanine and is amazing stuff. March 21, 2015
Rated 5 out of 5 by Does what it says I find I get a restful sleep after taking this supplement. February 4, 2015
Rated 5 out of 5 by calming I take 2 L-Theanine at night about 1/2 hr before I go to bed. I got the idea from Dr Oz. It is calming and lulls me into sleep. The price is right with Swansons. December 11, 2014
Rated 4 out of 5 by Suntheanine L-Theanine Surprisingly enough, this doesn't make me sleepy, so I don't take this at night. Instead, I take it in the morning, and it seems to relax my mind and help me focus more. It can be on the pricy side, so try to get it on sale or BOGO. November 27, 2014
Rated 5 out of 5 by good for relaxatuib I use this product to help calm my system. It does not work as a sleep aid for me, but keeps me feeling more peaceful in general.. October 3, 2014
Rated 5 out of 5 by Relax before bed I have been taking theanine for quite some time, at bed time, since I had read it helped with relaxation. I have a hard time sleeping, & like to use natural products to help various health conditions if possible. Theanine helps me wind down before bed & may contribute to better sleep. August 31, 2014
Rated 5 out of 5 by One Caveat I felt calmer and more peaceful on this supplement, generally more balanced, and I loved it. But I took it for about 60 days, one each morning. I don't think that is recommended. I started experiencing shortness of breath, which disappeared about two weeks after I stopped taking it. I still use it occasionally at bedtime to quiet my busy mind and have a good sleep. I do recommend it for that. May 2, 2014
Rated 5 out of 5 by Excellent for a good nights sleep! Perfect if you have trouble falling asleep or staying asleep! It works great for me, my husband and my adult daughter...we all love it and can't believe how great it works!! Try it...its great! April 2, 2014
Rated 5 out of 5 by Love this Calms my nerves without making me tired March 22, 2014
Rated 5 out of 5 by Wife finds it helpful My wife has used theanine for awhile. Says it helps her focus. I'd say that's so. February 19, 2014
Rated 5 out of 5 by It works. I found this to help with stress and was effective right away. I would take one or two in the am. I would also take one during the day if I felt stressed and it helped. Made me feel much calmer and helped improve my mood. Worked better than Sam-e. I would definitely recommend it. February 8, 2014
Rated 5 out of 5 by Sleep Aid I take Suntheanine every night for a good, restful sleep. January 22, 2014
Rated 5 out of 5 by Perfect chill pill This really helps me during stressful times, immediately after a workout, or falling back to sleep in the middle of the night. My one wish would be that Swanson start to offer larger sizes of this and other products at a discount. November 27, 2013
Rated 5 out of 5 by love this supplement I use this to calm my mind & it really helps. I usually take this at bedtime.Great product.I haven't tried any other products because this one works for me. November 4, 2013
Rated 5 out of 5 by Helps Me with Stress This product really helps to change my mood when I am stressed. It also helped my niece during an extremely rough time in her life. October 26, 2013
Rated 4 out of 5 by not bad..but Having used GABA for a few years and developing a little resistance to it, I thought I would temporarily switch to this for stress. This has more of a groggy side effect in the beginning but it went away. The GABA seems to be a "cleaner" product for me and my brain, but this is a decent alternative. GABA is a 5 leaf this is a 4 leaf. October 20, 2013
Rated 5 out of 5 by Exceptional One of the best products on the market today and at an exceptional value. September 28, 2013
Rated 5 out of 5 by Relaxation I am not a naturally relaxed individual and this product has helped a lot in that regard. I will continue to buy this along with so many other products I regularly buy from Swanson. September 12, 2013
Rated 2 out of 5 by didn't wear off... This product didn't wear off the next day as I had hoped it would. I felt groggy, draggy and bad. Wouldn't take again. August 7, 2013
Rated 5 out of 5 by Oh Let the Sun shine in.... ......this product has helped me face every day with a grin! C: August 1, 2013
Rated 5 out of 5 by Top quality!!! I definitely got a bit moody after menopause. In the past 5 years I have tried all the mood-enhancing supplements. I started with 5-HTP since it is a top serotonin precursor, but it had zero positive effects. In all my trail runs with other mood supplements--such as St John's Wort, Sam-e, GABA, etc.-- Suntheaniane L-Theanine is the ONLY one that has made a truly noticeable positive difference. We all have different brain chemistries so I cannot say you will have the same effects, but it works beautifully for me. Also, I have found no higher quality Suntheanine from even the most highly touted $$$ brands. Swanson's wins again!!! July 23, 2013
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Lee Swanson, Founder of Swanson Health Products

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