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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
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
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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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
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
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
Doctor's Best L-Theanine Contains Suntheanine, Helps Reduce Stress & Sleep, Non-GMO, Gluten Free, Vegan, 150 mg (DRB-00197), 90 Count
Suntheanine l-theanine contains 100% suntheanine, a patented pure form of the amino acid l-theanine produced in Japan from green tea leaves.
Doctor's Best L-Theanine Contains Suntheanine, Helps Reduce Stress & Sleep, Non-GMO, Gluten Free, Vegan, 150 mg (DRB-00197), 90 Count
Item #: 85433

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

Item #: 85433

€ 31

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Suntheanine l-theanine contains 100% suntheanine, a patented pure form of the amino acid l-theanine produced in Japan from green tea leaves.
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What Stands Out

Suntheanine Formula
Doctor's Best L-Theanine features Suntheanine, a premium patented form that promotes relaxation and stress reduction, enhancing overall well-being effectively compared to generic options.
Vegan & Non-GMO
This product is vegan, non-GMO, and gluten-free, catering to health-conscious consumers seeking natural supplements without any artificial additives.
Mindful Sleep Aid
With 150 mg per serving, it not only aids in reducing stress but also supports improved sleep quality, making it an essential addition to nighttime routines.

Product Details

Find Doctor's Best L-Theanine with Suntheanine at Ubuy Ireland. Helps reduce stress, improves sleep, non-GMO, gluten free, vegan. Shop now, 90 count.
  • Contains Suntheanine, a pure form of L-Theanine produced via a patented process
  • Promotes a healthy mood and relaxation while maintaining daytime alertness
  • Supports relaxation and a sense of calm without causing drowsiness
  • Enhances cognitive performance, alertness, and helps improve quality of sleep
  • May help reduce the negative effects of caffeine and support mental tranquility
  • Compact by Design identifies products with a more efficient design for lower carbon emissions
Is Discontinued By Manufacturer No
Product Dimensions 2.13 x 2.13 x 3.69 inches (5.4 x 5.4 x 9.4 cm); 2.12 ounces (60.1 grams)
Item model number DRB-00197
Department Health and Beauty>Health and Wellness
Date First Available September 1, 2009
Manufacturer Doctor's Best
Brand NameDoctor's BEST
Primary Supplement Typemultivitamin
Item FormCapsule
Diet TypeGluten Free
Product BenefitsRelaxation
Age Range DescriptionAdult
Container TypeBottle
Dosage Form150
Model Namer's Best L-Theanine Contains Suntheanine, Helps Reduce Stress & Sleep, Non-GMO, Gluten Free, Vegan, 150 mg (DRB-00197), 90 Count
UPC753950001978
ManufacturerDoctor's Best
Item Nype NameL-Theanine
Model NumberDRB-00197
Manufacturer Part NumberDRB-00197
Unit Count90 Count
Item Dimensions2.13 x 2.13 x 3.69 inches (5.4 x 5.4 x 9.4 cm)
Number of Items1
Total Servings Per Container90
FlavorUnflavored
Material FeaturesVegetarian
Specific Uses For ProductL-Theanine (Suntheanine®) 150 mg
Allergen InformationGluten Free
ColorNo Color
Package Weight1 Pound

Who Should Buy?

Suitable For
  • Stress Relief Seekers

    Individuals looking for natural remedies to manage stress and promote a sense of calm throughout the day.

  • Sleep Difficulty

    People who struggle with sleep problems and are seeking a natural solution to improve their sleep quality.

  • Dietary Preferences

    Those following a vegan or gluten-free diet who need supplements that align with their dietary restrictions.

Not Suitable For
  • Caffeine Users

    Individuals who consume caffeine regularly may not experience significant benefits from L-theanine supplementation.

Product Description

Dietary Supplement Disclaimer

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.


Have any Query? Chat with us

Customer Questions & Answers

  • Question: What is L-Theanine and how does it work?

    Answer: L-Theanine is an amino acid primarily found in green tea. It promotes relaxation without drowsiness, helping to reduce stress levels. This works by increasing the production of neurotransmitters, such as serotonin and dopamine, which play key roles in regulating mood and stress. For instance, taking L-Theanine can create a calm state that may enhance focus and concentration during work or study sessions.
  • Question: Can Doctors Best L-Theanine help improve sleep quality?

    Answer: Yes, Doctors Best L-Theanine can enhance sleep quality by promoting relaxation and reducing anxiety. By calming the mind and body, it prepares you for better quality sleep, making it easier to drift off and stay asleep. This is especially useful for those who struggle with racing thoughts at bedtime or need to unwind after a long day.
  • Question: Is Doctors Best L-Theanine suitable for everyone?

    Answer: Doctors Best L-Theanine is generally safe for most individuals, including those following vegan, gluten-free, or non-GMO diets, as it contains no animal products or allergens. However, it’s always advisable to consult a healthcare professional before starting any new supplement, especially for pregnant or nursing women or those with pre-existing health conditions.
  • Question: How should I take Doctors Best L-Theanine for best results?

    Answer: It is recommended to take one capsule of Doctors Best L-Theanine daily, preferably on an empty stomach. This enhances absorption and helps you reap maximum benefits for stress reduction and improved focus. Incorporating it into your daily wellness routine can make a significant difference in managing daily stressors.
  • Question: What are the possible side effects of L-Theanine?

    Answer: L-Theanine is considered safe with minimal side effects for most users. Some individuals might experience mild symptoms such as headaches, dizziness, or gastrointestinal discomfort. It is important to monitor how your body responds when starting the supplement and adjust the dosage as needed while ensuring you maintain a balanced diet.
  • Question: Is Doctors Best L-Theanine a natural stress reliever?

    Answer: Yes, L-Theanine is a natural amino acid known for its ability to foster relaxation and reduce stress. It promotes alpha brain wave activity, which can lead to a state of calm alertness. This makes it a popular choice for people looking to manage daily stress or anxieties without the sedative effects found in other supplements.
  • Question: Can L-Theanine be taken alongside other supplements?

    Answer: L-Theanine can generally be taken with other supplements, particularly those aimed at stress relief and mood enhancement, such as magnesium or herbal products like valerian root. It’s advisable, however, to consult with a healthcare provider to ensure compatibility and safety, particularly if you're using multiple supplements regularly.
  • Question: How does Suntheanine differ from regular L-Theanine?

    Answer: Suntheanine is a patented form of L-Theanine that is produced through fermentation, ensuring high purity and effectiveness. It is clinically studied and recognized for providing the calming effects of L-Theanine more reliably than other forms, making it the preferred option for stress relief and relaxation. This quality speaks to its relationship with enhanced mental clarity.
  • Question: Are there any dietary considerations for using this supplement?

    Answer: Doctors Best L-Theanine is non-GMO, gluten-free, and vegan, making it suitable for a wide range of dietary preferences and restrictions. This ensures that individuals with specific diets can incorporate it without compromising their nutritional choices, providing a stress-relief option that aligns with their lifestyle.
  • Question: Where can I buy Doctors Best L-Theanine in Ireland?

    Answer: You can purchase Doctors Best L-Theanine from Ubuy, where you can find reliable options for this supplement along with detailed product descriptions and customer reviews. Ubuy offers a user-friendly experience, making it easy to get the health products you need delivered directly to your door.

Nutritionist's Take

Doctor's Best L-Theanine is a popular dietary supplement that targets stress reduction and cognitive enhancement. L-Theanine, an amino acid primarily found in green tea, is known for its ability to promote relaxation without drowsiness, making it especially appealing for those seeking focus amidst anxiety. With 150mg per serving, the dosage aligns with research suggesting beneficial effects on mental wellness. Most nutritionists recognize the high-quality ingredient sourcing in this product, which is critical for efficacy. However, potential drawbacks include individual variability in response and limited evidence for some health claims. It is generally regarded as safe and vegan-friendly, making it suitable for various dietary preferences. Overall, while it can be a healthy addition for individuals managing stress, consumers should consider consulting a healthcare professional before starting any new supplement regimen.

Doctor's BEST 5-HTP DRB-00197 Editorial Review

Doctor's Best Suntheanine L-Theanine (150mg) Vegetable Capsules Doctor's Best Suntheanine L-Theanine is a highly effective and popular supplement for individuals suffering from anxiety and seeking relaxation. The main ingredient, Suntheanine, is a patented and advanced form of L-Theanine that offers a range of psychotherapeutic and neuro-cognitive benefits. One of the key benefits of Suntheanine is its ability to support the levels of GABA in the brain, leading to a calming effect. It also blocks glutamate receptors, reducing the brain's response to excitatory neurotransmitters. Additionally, Suntheanine induces Alpha Waves in the brain, promoting a relaxed state. Suntheanine is also a powerful antioxidant that can cross the blood-brain barrier, providing benefits against age-related neuro-cognitive conditions such as memory loss, learning impairments, attention deficits, dementia, and Alzheimer's disease. Customers have praised the effectiveness of Doctor's Best Suntheanine L-Theanine in reducing anxiety and promoting relaxation. Many have noticed a significant improvement in their anxious thinking and overall mood. Multiple reviewers have appreciated how this supplement has helped them deal with anxiety related to specific situations, such as flying. The majority of users have not reported any negative side effects, such as drowsiness or fatigue, making it suitable for daytime use. However, a few customers have mentioned that they did not notice a noticeable difference after taking the supplement. One customer mentioned that they were previously using a more expensive product but found Doctor's Best Suntheanine L-Theanine to be just as effective. It is important to note that the product does not contain caffeine, making it suitable for individuals looking for anxiety relief without stimulating effects. Overall, Doctor's Best Suntheanine L-Theanine is a well-regarded and effective supplement for anxiety relief and relaxation. Its specific formulation of Suntheanine offers a broader range of benefits compared to other similar supplements.

Customer Reviews & Ratings

4.6
2490 customers ratings
  • 5 Star
    77%
  • 4 Star
    12%
  • 3 Star
    6%
  • 2 Star
    2%
  • 1 Star
    3%

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Pros

  • Effective in reducing anxiety and promoting relaxation
  • Supports GABA levels and induces Alpha Waves in the brain
  • Powerful antioxidant properties to combat age-related neuro-cognitive conditions
  • No reported negative side effects such as drowsiness or fatigue
  • Suitable for use during the day

Cons

  • Some users may not notice a noticeable difference

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“The product received very good packaging & safe…Thank You”

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“The process was smooth, with clear communication and timelines. This was my 1st purchase and I am really impressed. I will definitely be coming back.”

12 June 2026 · via Trustpilot
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€ 31

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Features & Benefits

  • 100% suntheanine - pure form of l-theanine
  • Produced in Japan from green tea leaves
  • Subject of numerous safety studies and human clinical trials
  • Responsible for the taste and relaxation effects of green tea
  • Crosses the blood-brain barrier within 30 minutes of intake
  • Exerts its effects directly on the brain

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