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🧘‍♂️ L-Theanine Supplements in Bangladesh: Natural Calm for Mind, Mood & Sleep

L-Theanine, a bioactive amino acid present in green tea, is now available as a supplement in Bangladesh. Scientific research indicates that L-Theanine may support focus, reduce stress, improve sleep quality, and enhance cognitive function through natural mechanisms.

🌿 What is L-Theanine?

L-Theanine is a naturally occurring non-protein amino acid predominantly found in green tea (Camellia sinensis). Unlike amino acids involved in muscle synthesis, L-Theanine primarily influences neurological processes and promotes relaxation without causing drowsiness.
✅ Scientific Classification:
  • Chemical name: γ-glutamylethylamide
  • Category: Psychoactive dietary amino acid
  • Primary Actions: Increases alpha brain waves, enhances GABA, serotonin, and dopamine activity

💚 Benefits of L-Theanine Supplements

L-Theanine provides a safe, non-habit-forming option for individuals seeking to manage stress, improve focus, or enhance sleep, as supported by clinical research.

✅ 1. Reduces Stress & Anxiety

L-Theanine promotes relaxation without sedation by modulating neurotransmitters such as:
  • GABA, which acts as a natural buffer against anxiety
  • Dopamine, which contributes to mood regulation
  • Serotonin – emotional stability
A 2020 meta-review reported that daily doses of 200–400 mg of L-Theanine significantly reduced symptoms of stress and anxiety.
Source

✅ 2. Enhances Sleep Quality

L-Theanine improves:
  • Sleep latency (falling asleep faster)
  • Sleep efficiency (less waking at night)
  • Daytime alertness, without residual drowsiness
💤 A 4-week clinical study showed that 200 mg/day improved sleep duration and quality.
Source

✅ 3. Improves Focus, Attention & Memory

L-Theanine supplementation may benefit students, professionals, and individuals seeking cognitive enhancement by improving:
  • Alpha brainwave activity
  • Reaction time & working memory
  • Mental clarity during stress
🎯 A 100.6 mg dose improved attention in older adults within 1 hour.
Source

✅ 4. Supports Mental Health & Mood Balance

L-Theanine has demonstrated potential in:
  • Reducing depressive symptoms
  • Balancing mood in stress-prone individuals
  • Complementing mental health therapies
A study administering 250 mg per day for eight weeks reported significant improvements in depression and anxiety scores.
Source

✅ 5. Boosts Immune System

  • Enhancing T-cell immune response
  • Reduces upper respiratory infections
  • Supports immune resilience during stress
L-Theanine has been shown to improve immune response in individuals exposed to viral and bacterial pathogens.
Source

📦 L-Theanine Supplements in Bangladesh

As awareness of natural approaches to mental health and sleep increases, L-Theanine supplements are now available in Bangladesh in multiple formulations.

🛍️ Where to Buy:

Platform
Options
Notes
Daraz Bangladesh
 L-Theanine capsules/powder Verify seller reputation
E-Pharma Stores
 Branded formulations Check for authenticity
Health Shops (Dhaka, Chattogram)
 ON, Now Foods, Doctor’s Best Imported brands
Facebook Groups
 Nootropic/Supplement groups Watch for fake/counterfeit products

💰 Price Range in Bangladesh

Brand
Country
Form
Price (BDT)
Doctor’s Best USA Capsules ৳1,800–৳2,400
NOW Foods USA Capsules ৳2,200–৳2,800
Jarrow Formulas USA Capsules ৳2,100–৳2,700
Nutricost USA Powder ৳2,500–৳3,200

🧪 Recommended Dosage of L-Theanine

Goal
Dosage (mg/day)
Timing
Stress & Anxiety 200–400 mg AM or PM (split dose)
Sleep Improvement 200 mg 30–60 min before bed
Focus & Cognitive Boost 100–200 mg Morning or before tasks
It is recommended to begin with the lowest effective dose. Intake should not exceed 600 mg per day without medical supervision.

💊 Forms of L-Theanine Supplements

Form
Benefits
Capsules
 Easy to dose, travel-friendly
Powder
 Flexible dosing, budget-friendly
Blends
 Often paired with caffeine or magnesium
Sublingual
 Fast-acting, bypasses digestion
The combination of L-Theanine and caffeine is widely used to promote sustained energy and focused attention.

⚠️ Safety, Side Effects & Interactions

✅ Safe For Most People

L-Theanine is non-toxic and non-sedating, even at doses up to 900 mg per day in clinical trials.

❌ Who Should Be Cautious:

  • Pregnant or breastfeeding women (lack of data)
  • People with hypotension (can have slightly lower BP)
  • Those on sedatives or blood pressure medication
  • D-Theanine, a synthetic form, should be avoided due to its lower bioavailability.

🧠 Possible Side Effects (rare, mild):

  • Headache
  • Drowsiness
  • Nausea (high doses)
  • Lower blood pressure

🥦 Natural Sources of L-Theanine

Food/Drink
L-Theanine Content (mg) per cup
Green tea 8–30 mg
Black tea 5–20 mg
Oolong tea 7–25 mg
White tea 6–12 mg
🔍 Tea + L-Theanine supplement = double benefit, but monitor caffeine intake.

❓ FAQ: L-Theanine in Bangladesh

💬 Is L-Theanine legal in Bangladesh?

Yes. It’s sold as a dietary supplement and available both online and in health stores.

💬 Can I take it with antidepressants?

Speak to your doctor. L-Theanine may have additive effects on serotonin and dopamine.

💬 Is it addictive?

No. L-Theanine is non-habit forming and does not cause withdrawal symptoms.

💬 Can I take it with caffeine?

Yes! In fact, L-Theanine + Caffeine is one of the most researched nootropic stacks.

📚 References

  1. Li et al. (2022). L-Theanine: A functional amino acid in tea. Frontiers in Nutrition.
  2. Williams et al. (2020). L-Theanine and anxiety management. Plant Foods Hum Nutr.
  3. Wang et al. (2022). How L-theanine buffers stress. Food Sci Hum Wellness.
  4. Nuss (2015). GABA & anxiety disorders. Neuropsychiatr Dis Treat.
  5. Hidese et al. (2019). L-Theanine for stress & cognition. Nutrients.
  6. Deb et al. (2019). L-theanine’s neuroprotective potential. Neurochem Int.
  7. Imafuku et al. (2023). Effects on sleep quality. Nutrients.
  8. Hidese et al. (2017). Depression and mood modulation. Acta Neuropsychiatr.