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Doctor's Best L-Theanine Contains Suntheanine, Helps Reduce Stress & Sleep, Non-GMO, Gluten Free, Vegan, 150 mg (DRB-00197), 90 Count

4.6 4.6 out of 5 stars 2,227 ratings

Sustainability features

This product has sustainability features recognized by trusted certifications.

Packaging efficiency

Reduced air and/or water in the product or packaging for more efficient transportation.

As certified by
Compact by Design (Amazon-developed Certification) Compact by Design (Amazon-developed Certification)

Compact by Design identifies products that, while they may not always look very different, have a more efficient design. By reducing water and/or air in the product or packaging, these become more efficient to ship. At scale, these small differences in product size and weight lead to significant carbon emission reductions.

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About this item

  • Doctor’s Best L-Theanine contains Suntheanine, a pure form of L-Theanine on the market produced via a patented process that mimics the natural process in green tea leaves. L-Theanine helps promote a healthy mood and a restful relaxed state while maintaining daytime alertness
  • Product Note: Exposure to heat or sunlight may lead to melting/damage of product. Hence customers are expected to be available during the product delivery
  • CALMNESS – L-Theanine supports relaxation and a sense of calm without causing drowsiness or loss of focus. This amino acid found naturally in tea helps support healthy stress response, relaxation, focus and memory
  • SUPPORTS BRAIN HEALTH - L-Theanine is a powerful Amino Acid that enhances cognitive performance and alertness. L-Theanine may help improve quality of sleep, learning performance, concentration and help support the immune system. L-Theanine may also help reduce the negative effects of caffeine
  • SUNTHEANINE - L-theanine is an agent that is used for nervousness and tension by supporting mental tranquility. Suntheanine may normalize the body’s stress response and condition the body to handle stressful situations better
  • During the summer months products may arrive warm but Amazon stores and ships products in accordance with manufacturers' recommendations, when provided.

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Sustainability features

Sustainability features

This product has sustainability features recognized by trusted certifications.

Packaging efficiency

Reduced air and/or water in the product or packaging for more efficient transportation.

As certified by
Compact by Design (Amazon-developed Certification) Compact by Design (Amazon-developed Certification)

Compact by Design identifies products that, while they may not always look very different, have a more efficient design. By reducing water and/or air in the product or packaging, these become more efficient to ship. At scale, these small differences in product size and weight lead to significant carbon emission reductions.

Learn more about this certification

Part of
Sustainability features
Climate Pledge Friendly

Focus on sustainability

Compact by design from Climate pledge friendly. Certified by Amazon.

Small changes in product size & weight lead to lower carbon emissions.

We created Compact by Design to identify products that, while they may not always look very different, have a more efficient design. With the removal of excess air and water, products require less packaging and become more efficient to ship. At scale, these small differences in product size and weight lead to significant carbon emission reductions.

Here are a few of the many ways products can qualify:

Less packaging

Less air in container

More efficient shape

Waterless technology

Product Description

Doctor's Best L-Theanine Contains Suntheanine, Helps Reduce Stress & Sleep, Non-GMO, Gluten Free, Vegan, 150 mg (DRB-00197), 90 Count

Product details

  • Is Discontinued By Manufacturer ‏ : ‎ No
  • Product Dimensions ‏ : ‎ 2.13 x 2.13 x 3.69 inches; 0.01 ounces
  • Item model number ‏ : ‎ DRB-00197
  • Department ‏ : ‎ Health and Beauty>Health and Wellness
  • Date First Available ‏ : ‎ September 1, 2009
  • Manufacturer ‏ : ‎ Doctor's Best
  • ASIN ‏ : ‎ B001OXTGVG
  • Country of Origin ‏ : ‎ USA
  • Customer Reviews:
    4.6 4.6 out of 5 stars 2,227 ratings

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Doctor's Best L-Theanine Contains Suntheanine, Helps Reduce Stress & Sleep, Non-GMO, Gluten Free, Vegan, 150 mg (DRB-00197), 90 Count
Doctor's Best L-Theanine Contains Suntheanine, Helps Reduce Stress & Sleep, Non-GMO, Gluten Free, Vegan, 150 mg (DRB-00197), 90 Count
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Price$20.21-10% $18.90
Typical:$21.00
-18% $13.99
List:$16.99
$21.95-39% $12.24
List:$19.99
-25% $29.97
List:$39.99
Price Per Unit$0.22 / Count$0.63 / Count$0.28 / Count$10.98 / Fl Oz$0.12 / Count$0.17 / Count
Delivery
Get it as soon as Monday, Apr 1
Get it as soon as Monday, Apr 1
Get it as soon as Monday, Apr 1
Get it as soon as Monday, Apr 1
Get it as soon as Monday, Apr 1
Get it as soon as Monday, Apr 1
Customer Ratings
Flavor
4.7
4.5
3.9
4.4
4.2
4.4
Easy to swallow
4.8
3.5
4.7
4.3
4.7
Value for money
4.4
5.0
3.8
4.3
4.4
Sold By
Amazon.com
Amazon.com
Amazon.com
MaryRuth Organics, LLC
Amazon.com
Green Valley Health Market LLC
keyword type
5-htp-nutritional-supplements
multiple-vitamin-mineral-combinations
multiple-vitamin-mineral-combinations
multiple-vitamin-mineral-combinations
multiple-vitamin-mineral-combinations
vitamin-b8-inositol
form
Capsule
Tablet
Chewable
Drop
Capsule
Capsule
flavor
Unflavored
Unflavored
Tropical Fruit
Lemon Lime
Unflavored
Unflavored
size
90 Count (Pack of 1)
30 Count (Pack of 1)
50 Count (Pack of 1)
2 Fl Oz (Pack of 1)
100 Count (Pack of 1)
180 Count (Pack of 1)
weight
0 pounds
0.11 pounds
0.1 kilograms
0.1 kilograms
age range
Adult
Adult
Adult
Adult
Adult
Adult
product benefit
Relaxation
Promotes relaxation—without making you sleepy, Encourages brain wave patterns associated with wakeful relaxation, All day stress support with extended-release technology
Stress Relief
Stress Relief
Relaxation
Stress Management
serving suggestion
1 Capsule
Take one (1) tablet daily, or as recommended by a healthcare practitioner.
One Tablet
1 capsule
1 capsule

Important information

Safety Information

This product is labelled to United States standards and may differ from similar products sold elsewhere in its ingredients, labeling and allergen warnings

Indications

not available

Ingredients

L-Theanine (as Suntheanine) 150 mg, Microcrystalline cellulose, modified cellulose (vegetarian capsule.)

Directions

One capsule daily, or as directed by a health care practitioner. Store in a cool dry place.

Legal Disclaimer

Statements regarding dietary supplements have not been evaluated by the FDA and are not intended to diagnose, treat, cure, or prevent any disease or health condition.

Looking for specific info?

Customer reviews

4.6 out of 5 stars
4.6 out of 5
2,227 global ratings

Customers say

Customers like the quality, value, and effect of the nutritional supplement. For example, they mention it's a great product, works well, and is well worth the investment. Customers are also impresseded with the focus, and ease of swallowing. That said, opinions are mixed on performance and durability.

AI-generated from the text of customer reviews

205 customers mention179 positive26 negative

Customers like the mood of the nutritional supplement. They mention that it helps them feel calmer, more lucid, and relaxed. They also say it promotes a calming attitude and reduces stress levels. Some say that it doesn't make them sleepy and helps with a good night sleep.

"...After I take even one dose, I sleep like the proverbial baby, with no waking, and no negative after effects the next morning/day...." Read more

"...It can cross the blood brain barrier and has a positive effect on alpha-brain waves; it has a relaxing effect, reducing physical and mental stress,..." Read more

"...the night if I can't go to sleep, and I find it tends to relieve symptoms of not sleeping, which in my case, are worse and probably more anxiety-..." Read more

"...After starting this supplement, I noticed a marked reduction in his stress level...." Read more

89 customers mention89 positive0 negative

Customers are satisfied with the quality of the nutritional supplement. They mention that it works well, is generally effective, and is a high quality source of L-theanine. Some say that it's the best L-Theanine supplement they've ever taken and that it helps with anxiety.

"...It was incredibly timely!..." Read more

"...In general, I am very pleased with this safe and generally effective alternative to potentially risky prescription medications, and hopefully soon..." Read more

"...It worked great - but it was expensive. $30 for thirty tablets...." Read more

"...Awesome product. Helped me immediately. Here is some more helpful information about Suntheanine...." Read more

42 customers mention32 positive10 negative

Customers like the value of the nutritional supplement. They say it's well priced, worth the investment, and the cheapest source of quality theanine on the market.

"...significant drop in anxiety and stress to this brand with a price that is excellent as well! Thank you, Nutricost!..." Read more

"...stay away from prescription medication -- this is certainly worth a try at the price that it is offered here...." Read more

"I got these because they had the best price per milligram of what's supposed to be genuine Suntheanine, which is the only brand that ever really..." Read more

"...It worked great - but it was expensive. $30 for thirty tablets...." Read more

36 customers mention33 positive3 negative

Customers like the effect of the nutritional supplement on their blood pressure. They say it takes away any side effects of Adderall that they were experiencing. They also say it curbs all negative effects and makes a huge difference in their overall well being. Customers also mention that when taken with food, its effects are muted and it smooths the side effects.

"...dose, I sleep like the proverbial baby, with no waking, and no negative after effects the next morning/day. I do not take it every night...." Read more

"...The risks: I have had no side effects while using this, and I'm pretty sure many others can say the same...." Read more

"...A completely natural substance, Suntheanine does not produce the undesirable side effects produced by synthetic drugs such as fatigue and..." Read more

"...one of these in the morning with my all-in-one supplement it curbs all negative effects I would always get with caffeine!..." Read more

14 customers mention14 positive0 negative

Customers say the nutritional supplement allows them to focus better, is great with coffee, and is good for caffeine sensitivity. They also say it helps them feel calmer, more lucid, and even more energetic. Customers also mention that it's great in the morning with coffee for focus without jitters.

"...I'm calmer, more focused, and less prone to depressive thoughts...." Read more

"...I am more focused, calmer, I don't forget where things are, I'm more patient, I don't feel the urge to talk all the time, I'm a better listener, I..." Read more

"...Finally I could rest! Later I also learned that it was good for caffeine sensitivity...." Read more

"...I am not as wired and jittery as I used to be and my focus has improved a great deal." Read more

8 customers mention8 positive0 negative

Customers find the nutritional supplement easy to swallow. They mention the capsules are small enough and have no after taste. Some say the supplement helps detox the liver and digest all foods.

"Small capsule, super easy to swallow. I take one in the morning and one at lunch...." Read more

"...I feel the same. More stars because they are easy to swallow, and there's no flavor/after taste with them...." Read more

"...Easy to swallow caps. My 6 year old can often swallow these, so they aren't huge. I would say they are close to a sz 4 capsule...." Read more

"This is a Very Good product. The capsules are easily swallowed and take effect shortly after taking One. I recommend this form of L-Theanine" Read more

61 customers mention30 positive31 negative

Customers are mixed about the performance of the nutritional supplement. Some mention that it does wonders, works well for anxiety issues, and improves sleep. They also say it works great with caffeine and a caffeine pill stack. However, others say that it didn't work well for them, doesn't have an instant effect, and loses effectiveness over time.

"...Suntheanine encourages the activity of neurotransmitters, which help regulate attention, learning, mood, memory, body temperature, appetite and sleep..." Read more

"I took this for about a week. I saw zero results... feels like a scam product." Read more

"I am beyond happy with this product. It is very effective. I’ve never been disappointed with a supplement from this brand...." Read more

"I was looking for an alternative to my prescription Xanax. It doesn't work like Xanax meaning its not an instant effect...." Read more

10 customers mention6 positive4 negative

Customers are mixed about the durability of the nutritional supplement. Some mention that it seems to last most of the day, while others say that it wears off in a few hours.

"...One bottle easily lasts me two months compared to the one month with the more expensive brands...." Read more

"...It was too strong for me to use during the day, and took it only at bedtime...." Read more

"...I take this in the morning with breakfast, and it seems to last most of the day...." Read more

"...took this products I noticed a very mild calming effect that wore off in a few hours...." Read more

Best suntheanine my son has used so far
5 Stars
Best suntheanine my son has used so far
Best suntheanine my son has used so far. Age 12, he takes 1 pill. Helps him w concentration and focus at school. He even asks for it when he has a test that day. Easy to swallow, great product.
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Top reviews from other countries

Parth Rajvansh
5.0 out of 5 stars Was very excited before purchase.....
Reviewed in India on November 26, 2022
2 people found this helpful
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pritam shirode
5.0 out of 5 stars It works great
Reviewed in India on March 1, 2020
4 people found this helpful
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alex varghese
5.0 out of 5 stars Best product
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2 people found this helpful
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prabhat sharma
4.0 out of 5 stars Have taken it before interviews. It increases alertness and ...
Reviewed in India on August 9, 2014
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Disclaimer: While we work to ensure that product information 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 Web site. We recommend that you do not solely rely on the information presented and that you always read labels, warnings, and directions before using or consuming a product. For additional information about a product, please contact the manufacturer. Content on this site is for reference purposes and is not intended to substitute for advice given by a physician, pharmacist, or other licensed health-care professional. You should not use this information as self-diagnosis or for treating a health problem or disease. Contact your health-care provider immediately if you suspect that you have a medical problem. Information and statements regarding dietary supplements have not been evaluated by the Food and Drug Administration and are not intended to diagnose, treat, cure, or prevent any disease or health condition. Amazon.com assumes no liability for inaccuracies or misstatements about products.