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Doctor's Best, Suntheanine L-Theanine, 150 mg, 90 Veggie Caps

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In Stock
  • Expiration Date: Jun 2018
  • Shipping Weight: 0.17 lbs (0.08 kg)
  • Product Code: DRB-00197
  • UPC Code: 753950001978
  • Package Quantity: 90 Veggie Caps
  • Dimensions: 4 x 2.1 x 2.1 in, 0.1 lbs (0.05 kg)
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Product Overview


  • Science-Based Nutrition
  • Dietary Supplement
  • Helps Promote Relaxation without Drowsiness
  • Helps Reduce Stress and Tension
  • Vegan

Suntheanine is the premier, patented form of the amino acid L-theanine. Suntheanine is the purest form of L-theanine on the market today. L-theanine is an amino acid derived from green tea that is responsible for the relaxation-inducing effect of tea consumption.

  • Helps promote a relaxed state without drowsiness.
  • Helps ease stress and everyday nervous tension.
  • Helps promotes a healthy mood and alertness.

Suggested Use

Suggested Adult Use: Take 1 capsule daily away from food, or as recommended by a nutritionally-informed physician.

Other Ingredients

Microcrystalline cellulose, modified cellulose (vegetarian capsule)

Non-GMO, gluten-free, vegan


Store in a cool dry place.

Supplement Facts
Serving Size: 1 capsule
Serving Per Container: 90 servings
  Amount Per Serving %Daily Value
Suntheanine L-theanine 150 mg
†Daily Value not established.
iHerb Customer Reviews


Posted by 5620678987357385644 on Dec 06, 2016

I have tried now foods l theanine in the past. It was too average. If i had panic attack now foods had no effect. Not only this i had to take it and wait for at least 40 min to see any results. So i had only positive results ifi was already in somewhat good mood and after 40 min of taking it. Then i changed to this brand and it is amazing. I can say that 2 pills (300mg) of this product is like 0,5 mg xanax with only postive effects ,, without feeling dizzy and moreover feeling relaxed and much more happier together. It works at most at 10 min after taking them. You want to feel relaxed and happy cool TAKE IT. 2 pills each time and you are ok. By far the best supplement i have ever take (and the first one i take from this brand). Its the first one 5/5 star review on supplements i make.

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Nothing Special

Posted by 4658313037497252816 on Nov 03, 2016

Didn't do anything to me.

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For hormones

Posted by 5575193942212286226 on Oct 30, 2016

I bought these to help balance my hormones, though I cannot exactly tell you how that works, because I've forgotten. Big help, I know. HOWEVER, these are amazing for anxiety. I wanted to write a review to tell you to BUY THESE because they are a holy grail supplement for anxiety, stress, and depression.

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No noticeable effect for me.

Posted by 5308342432213357870 on Oct 22, 2016

Wish I could feel the difference, but unfortunately both my boyfriend and I don't feel any different / more relaxed after eating this.

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Too many side effects

Posted by 5225468070068524397 on Sep 27, 2016

This product had a sedative effect on me as a sleep aid, but it caused headaches, lethargy, depression, palpitations and general feeling of being unsettled. I stuck it out for a few days, hoping I'd get used to it, but will not continue with it any longer.

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