---
product_id: 685676431
title: "Double Strength L Theanine 400mg, 400 Capsules | Max Potency L-Theanine Supplement for Relaxation, Sleep & Calm Support | Bioavailable Free Form | Natural Amino Acid for Women & Men | Non-GMO"
brand: "naturebell"
price: "฿2415"
currency: THB
in_stock: true
reviews_count: 9
category: "Nature Bell"
url: https://www.desertcart.co.th/products/685676431-double-strength-l-theanine-400mg-400-capsules-max-potency-l
store_origin: TH
region: Thailand
---

# 400mg max potency per serving 400 capsules bulk supply 3rd party lab tested purity Double Strength L Theanine 400mg, 400 Capsules | Max Potency L-Theanine Supplement for Relaxation, Sleep & Calm Support | Bioavailable Free Form | Natural Amino Acid for Women & Men | Non-GMO

**Brand:** naturebell
**Price:** ฿2415
**Availability:** ✅ In Stock

## Summary

> 💼 Elevate your focus and calm—because your busy mind deserves the best

## Quick Answers

- **What is this?** Double Strength L Theanine 400mg, 400 Capsules | Max Potency L-Theanine Supplement for Relaxation, Sleep & Calm Support | Bioavailable Free Form | Natural Amino Acid for Women & Men | Non-GMO by naturebell
- **How much does it cost?** ฿2415 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.th](https://www.desertcart.co.th/products/685676431-double-strength-l-theanine-400mg-400-capsules-max-potency-l)

## Best For

- naturebell enthusiasts

## Why This Product

- Trusted naturebell brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Gentle Daily Ritual:** Easily absorbed amino acid promoting relaxation and mood balance without side effects
- • **Clean & Pure Formula:** Non-GMO, allergen-free, and 3rd party tested for safety and potency
- • **Balanced Energy Support:** Smooths caffeine jitters while enhancing focus—perfect for busy professionals
- • **Mega Supply, Mega Value:** 400 capsules per bottle means no monthly reorders—stay stocked and stress-free
- • **Power-Packed Calm Focus:** 400mg pure L-Theanine delivers potent, clean mental clarity without drowsiness

## Overview

NatureBell’s Double Strength L-Theanine offers a potent 400mg dose per serving in a massive 400-capsule supply. This non-GMO, allergen-free supplement supports daily calmness and sustained focus without sedation, backed by 3rd party lab testing for purity and potency. Ideal for professionals seeking natural stress relief and balanced mental clarity, it pairs seamlessly with caffeine to smooth jitters and enhance productivity.

## Description

Buy Double Strength L Theanine 400mg, 400 Capsules | Max Potency L-Theanine Supplement for Relaxation, Sleep & Calm Support | Bioavailable Free Form | Natural Amino Acid for Women & Men | Non-GMO on desertcart.com ✓ FREE SHIPPING on qualified orders

Review: Calm Focus, Big Supply, Real Results - ⭐️⭐️⭐️⭐️⭐️ Calm Focus, Big Supply, Real Results The Double Strength L-Theanine supplement is an excellent option if you want maximum potency and long-term value. With 400 mg per serving and 400 capsules, this isn’t just a supplement — it’s a serious stock-up solution for daily mental balance. I take one capsule when I need to dial in my focus without the caffeine edge, or in the evening when my mind needs to unwind without feeling sleepy. The effect is clean, subtle, and natural: less mental noise, smoother stress response, and a relaxed clarity that lets you stay productive without feeling wired. Unlike many lower-dose options, the 400 mg strength actually feels meaningful — especially for high-stress days or pairing with coffee to soften jitters while keeping alertness. No strange taste, no stomach upset, no crash. Just consistent cognitive support that feels gentle and effective. One of the biggest wins is the capsule count. With 400 in the bottle, I don’t have to reorder every month, which saves money and hassle. Packaging was secure and freshness intact. Great for anyone serious about mood support and nootropic supplementation. Top benefits I’ve noticed: 🧘 Reduced stress, no drowsy feeling 🧠 Better balanced focus and calm attention ☕ Helps smooth caffeine side effects 🌙 Supports relaxation at night 📆 Huge supply lasts a long time Pros: ✔ 400 mg = high, effective dosage ✔ 400 capsules = unbeatable bulk value ✔ Supports calm focus without sedation ✔ No bad aftertaste or side effects ✔ Great for coffee pairing or evening use ✔ Ideal for long-term daily routines Cons: • Because it’s higher potency, beginners may want to start slowly to find their ideal dose — but if you already use L-Theanine, this strength is a total win. If you want a strong, clean, and reliable nootropic for calm focus and stress support, this is it. Incredible value, great potency, and smooth results that genuinely improve the day. I’ll keep this in my routine! 👏 Double Strength L Theanine 400mg, 400 Capsules
Review: Must have - This is a wonderful best product ever. This helps my husband and I to sleep way better. We both get much needed sleep. The size is nice. This does help improve the mood. No side effects for us both. This is so gentle on both of our stomachs. No taste. This is so easy to take. I take 2 once a day. My wife takes 2 of these every night. We will keep ordering this wonderful product.

## Features

- Max potency L-Theanine Capsules, 400mg per serving (200mg per capsule), naturally occurring amino acid support for daily calmness and lasting focus.
- 400 capsules bulk supply, 2 capsules per serving that contain 400mg of pure l-theanine per dose.
- Taking L-theanine regularly promotes relaxation and focus for men and women, it offers soothing benefits without causing drowsiness.
- L-theanine is a free-form amino acid that can be easily absorbed, it creates balance throughout the body and can mainly be found in specific tea leaves and rare mushrooms.
- Authentic non-GMO theanine supplements. Contains pure ingredients free of soy, dairy, gluten, wheat, eggs, fish, peanuts, and tree nuts. All products are also 3rd party lab tested for safety and potency.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN  | B0DDCW97QV |
| Best Sellers Rank | #28,318 in Health & Household ( See Top 100 in Health & Household ) #427 in Amino Acid Nutritional Supplements |
| Customer Reviews | 4.6 4.6 out of 5 stars (434) |
| Date First Available  | August 16, 2024 |
| Manufacturer  | NatureBell |
| Package Dimensions  | 6.22 x 3.19 x 3.11 inches; 4 ounces |

## Product Details

- **Brand:** NatureBell
- **Flavor:** Unflavored
- **Item Form:** Capsule
- **Item Weight:** 4 Ounces
- **Manufacturer:** NatureBell
- **Number of Items:** 1
- **Product Benefits:** General Health
- **UPC:** 850062082250
- **Unit Count:** 400 Count

## Images

![Double Strength L Theanine 400mg, 400 Capsules | Max Potency L-Theanine Supplement for Relaxation, Sleep & Calm Support | Bioavailable Free Form | Natural Amino Acid for Women & Men | Non-GMO - Image 1](https://m.media-amazon.com/images/I/71f9+uP8TkL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Calm Focus, Big Supply, Real Results
*by J***D on November 29, 2025*

⭐️⭐️⭐️⭐️⭐️ Calm Focus, Big Supply, Real Results The Double Strength L-Theanine supplement is an excellent option if you want maximum potency and long-term value. With 400 mg per serving and 400 capsules, this isn’t just a supplement — it’s a serious stock-up solution for daily mental balance. I take one capsule when I need to dial in my focus without the caffeine edge, or in the evening when my mind needs to unwind without feeling sleepy. The effect is clean, subtle, and natural: less mental noise, smoother stress response, and a relaxed clarity that lets you stay productive without feeling wired. Unlike many lower-dose options, the 400 mg strength actually feels meaningful — especially for high-stress days or pairing with coffee to soften jitters while keeping alertness. No strange taste, no stomach upset, no crash. Just consistent cognitive support that feels gentle and effective. One of the biggest wins is the capsule count. With 400 in the bottle, I don’t have to reorder every month, which saves money and hassle. Packaging was secure and freshness intact. Great for anyone serious about mood support and nootropic supplementation. Top benefits I’ve noticed: 🧘 Reduced stress, no drowsy feeling 🧠 Better balanced focus and calm attention ☕ Helps smooth caffeine side effects 🌙 Supports relaxation at night 📆 Huge supply lasts a long time Pros: ✔ 400 mg = high, effective dosage ✔ 400 capsules = unbeatable bulk value ✔ Supports calm focus without sedation ✔ No bad aftertaste or side effects ✔ Great for coffee pairing or evening use ✔ Ideal for long-term daily routines Cons: • Because it’s higher potency, beginners may want to start slowly to find their ideal dose — but if you already use L-Theanine, this strength is a total win. If you want a strong, clean, and reliable nootropic for calm focus and stress support, this is it. Incredible value, great potency, and smooth results that genuinely improve the day. I’ll keep this in my routine! 👏 Double Strength L Theanine 400mg, 400 Capsules

### ⭐⭐⭐⭐⭐ Must have
*by B***N on November 8, 2025*

This is a wonderful best product ever. This helps my husband and I to sleep way better. We both get much needed sleep. The size is nice. This does help improve the mood. No side effects for us both. This is so gentle on both of our stomachs. No taste. This is so easy to take. I take 2 once a day. My wife takes 2 of these every night. We will keep ordering this wonderful product.

### ⭐⭐⭐⭐⭐ Good value
*by D***L on January 19, 2026*

Product is as described

## Frequently Bought Together

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*Product available on Desertcart Thailand*
*Store origin: TH*
*Last updated: 2026-01-28*