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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
  • Product Code: DRB-00197
  • UPC Code: 753950001978
  • Package Quantity: 90 Veggie Caps
  • Dimensions: 4 x 2.1 x 2.1 in, 0.1 lbs
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

Good for all sorts of stress

Posted by Suppster on Jan 12, 2017

Good quality and has helped with anxiety, hectic days, stydying, overstimulation from stress and relaxation before bed.

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Hasn't helped my anxiety

Posted by 4721429621855872063 on Dec 17, 2016

I was looking forward to trying this for my anxiety and panic attacks after reading all of the great reviews. Unfortunately I feel no different. I still think anyone with these issues should give it a try, it's cheap and seems to have helped a lot of people. Good luck!!

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Posted by arpeey on Dec 15, 2016

It works. This suntheanine L-theanine from Doctors best for me does what it says on the box.Been taken it for months and I can feel its wonderful effect.

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最天然的抗焦慮劑量,six stars!

Posted by cattylee on Dec 09, 2016


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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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