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

$16.43 $16.43 (Saved $13.56)

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

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$0.18/Veggie Caps
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Doctor's Best, Suntheanine L-Theanine, 150 mg, 90 Veggie Caps

In Stock
  • Expiration Date: November 2019
  • Shipping Weight:
    0.13 lbs
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  • Product Code: DRB-00197
  • UPC Code: 753950001978
  • Package Quantity: 90 Veggie Caps
  • Dimensions:
    4 x 2.1 x 2.1 in, 0.1 lbs
    Switch to Metric units

Product Rank:

#2 in L Theanine >
#90 in Sports >
Frequently Purchased Together
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.


While iHerb strives to ensure the accuracy of its product images and information, some manufacturing changes to packaging and/or ingredients may be pending update on our site. Although items may occasionally ship with alternate packaging, freshness is always guaranteed. We recommend that you read labels, warnings and directions of all products before use and not rely solely on the information provided by iHerb.
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

Makes me calm...

Posted by iHerb Customer on March 23 2018 | Verified Purchase

This product makes me calm and relaxed, but i can't take it before bed because it interrupts my sleep. When taking in the morning i feel it is working for 6 hours so that's no problem. Good product!

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Sunshine for Sure

Posted by iHerb Customer on March 13 2018 | Verified Purchase

I bought this along with the GABA to help with my sleep issues. They do work, but I would recommend taking just one product at a time if you have a leaky brain like I do. I was in a fog until about noon the next day when I took both this and the GABA. But, this product by itself works like a charm as I am in a happier mood the next day it seems. The Suntheanine version of it is supposed to be more potent; and I believe that it is. I do highly recommend this product.

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No Benefits

Posted by iHerb Customer on March 2 2018 | Verified Purchase

Does not do anything to me. I'm still filling ancient

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The King Of All Products

Posted by iHerb Customer on February 19 2018 | Verified Purchase

This is what cured me after years of depression and anxiety ! I can’t be more thankful ...

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Not convinced

Posted by iHerb Customer on February 11 2018 | Verified Purchase

I don't know. Sometime I get effect and sometimes not. Might be placebo.

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