Doctor’s Best L-Theanine
2,900.00৳ Original price was: 2,900.00৳ .2,780.00৳ Current price is: 2,780.00৳ .
Key points: Doctor’s Best L-Theanine
- Contains premium Suntheanine® L-Theanine
- Helps promote calm, relaxation, and focus
- Non-drowsy formula
- Supports cognitive performance
- GMO-free and gluten-free
- Easy-to-swallow capsules
- Manufactured in GMP-certified facilities
| Weight | 0.1 g |
|---|---|
| Dimensions | 27 × 23 × 3.5 cm |
| Brand |
Doctor’s Best |
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In Dhaka city Delivery fee: 79 taka
Out of Dhaka Delivery fee: 119 taka

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Doctor’s Best L-Theanine: Calm Focus, Stress Relief & Mental Clarity in One Simple Capsule
Modern life brings constant pressure—emails, deadlines, noise, and endless tasks. It’s easy to feel overwhelmed, tense, or distracted. Many people want a simple, natural way to stay calm while staying mentally sharp. That’s why L-Theanine, an amino acid found in green tea, has become one of the most popular stress-support supplements.
Doctor’s Best L-Theanine delivers a clean, high-quality form of L-Theanine designed to promote relaxation without drowsiness, improve focus, and support a balanced mood. Whether you’re looking to unwind after a long day or stay centered during work, this supplement can help.
This guide explains everything about how it works, what’s inside, how to use it, and what to expect.
⭐ What Is L-Theanine?
L-Theanine is a naturally occurring amino acid known for:
- Supporting relaxation without sedation
- Enhancing mental focus and clarity
- Helping balance stress-related hormones
- Supporting smooth, calm energy
- Encouraging alpha brain wave activity (associated with focus + calmness)
Doctor’s Best uses Suntheanine®, a patented, clinically studied form of L-Theanine known for purity and consistent results.
Benefits
- Encourages a relaxed yet alert mental state
- Helps reduce everyday stress
- Supports balanced mood and emotional well-being
- Promotes concentration and mental clarity
- Helps reduce tension and irritability
- May support sleep quality (when taken in the evening)
- Provides smooth, balanced energy—not jittery like caffeine
🧪 Ingredients (Typical Formula)
1. Suntheanine® (L-Theanine)
- Clinically researched
- Supports calm alertness
- Encourages alpha-wave brain activity
- Helps regulate stress signals in the brain
Other Ingredients
- Modified cellulose (vegetarian capsule)
- Rice powder
- Magnesium stearate (vegetable source)
Free from artificial preservatives, flavors, or stimulants.
⚙️ How Doctor’s Best L-Theanine Works
1. Increases Alpha Brain Waves
These waves are linked to calm focus, creativity, and “relaxed alertness.”
2. Supports Neurotransmitters
L-Theanine interacts with:
- GABA – calming
- Dopamine – motivation & mood
- Serotonin – emotional balance
This helps regulate mood and stress responses.
3. Reduces Stress Without Causing Drowsiness
Unlike sedatives, it won’t make you feel sleepy—just balanced.
4. Enhances Cognitive Performance
Helpful during work, study, or stressful situations.
5. Supports Sleep (When Taken at Night)
Calms the mind enough to improve sleep onset and quality.
📌 How to Use
- Take 1 capsule daily, with or without food
- Morning for focus and calm energy
- Evening for relaxation before sleep
- Safe to pair with caffeine for a “smooth energy” effect (“L-Theanine + coffee stack”)
⚠️ Side Effects
L-Theanine is well-tolerated.
Possible mild side effects:
- Headache
- Nausea
- Dizziness
- Mild digestive upset
Side effects are rare and typically temporary.
🚨 Overdose Effects
Taking too much may cause:
- Hypotension (low blood pressure)
- Excessive relaxation
- Headache
- Stomach discomfort
- Sleepiness
Do not exceed the recommended dose.
People Also Ask
1. What does L-Theanine help with?
It supports calmness, focus, and balanced mood.
2. Does L-Theanine make you sleepy?
No—it promotes relaxation without sedation.
3. How long does L-Theanine take to work?
Most people feel effects within 30–60 minutes.
4. Is L-Theanine safe to take every day?
Yes, when used as directed.
5. Can L-Theanine be taken with caffeine?
Yes—it helps smooth out caffeine jitters.
- Is this the real Suntheanine®?
Doctor’s Best uses premium Suntheanine® L-Theanine.
2. Will this help with focus at work?
Many customers report improved calm focus.
3. Does it reduce anxiety?
It supports stress balance, which may reduce anxious feelings.
4. Can I take it on an empty stomach?
Yes—it’s gentle and absorbs well.
5. Is it vegetarian?
Yes—it uses a vegetarian capsule.
Conclusion
Doctor’s Best L-Theanine provides clean, non-drowsy stress support for anyone who wants calmness, focus, and emotional balance. With its premium Suntheanine® extract and strong research background, it’s a reliable supplement for managing day-to-day stress without using stimulants or sedatives.
If you want to stay relaxed yet mentally sharp, this supplement is a simple and effective choice.
Dhaka City 75 taka (Delivery Within 24-72 hours)
Dhaka District 115/- Taka Delivery time 2 to 3 days
Whole Bangladesh 140/- Taka 3 to 5 days


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