---
product_id: 1864778
title: "Doctor's Best Suntheanine L-Theanine - 90 Vegetarian Capsules"
brand: "doctor's best"
price: "$49.61"
currency: USD
in_stock: true
category: "Doctor's Best"
url: https://www.desertcart.us/products/1864778-doctors-best-suntheanine-l-theanine-90-vegetarian-capsules
store_origin: US
region: United States of America
---

# Supports alert calm & mental focus 90 vegan, non-GMO veggie capsules 150 mg pure Suntheanine L-Theanine Doctor's Best Suntheanine L-Theanine - 90 Vegetarian Capsules

**Brand:** doctor's best
**Price:** $49.61
**Availability:** ✅ In Stock

## Summary

> 🧘‍♂️ Stay sharp, stay calm — the smart millennial’s secret weapon!

## Quick Answers

- **What is this?** Doctor's Best Suntheanine L-Theanine - 90 Vegetarian Capsules by doctor's best
- **How much does it cost?** $49.61 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/1864778-doctors-best-suntheanine-l-theanine-90-vegetarian-capsules)

## Best For

- doctor's best enthusiasts

## Why This Product

- Trusted doctor's best brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Pure Focus Fuel:** 150 mg of Suntheanine per capsule delivers clean, sustained mental clarity without jitters.
- • **Clean & Conscious:** Non-GMO, gluten-free, soy-free, and vegan-friendly to fit your mindful lifestyle.
- • **Easy Daily Ritual:** Convenient, easy-to-swallow vegetarian capsules designed for seamless integration into your wellness routine.
- • **Stress-Free Hustle:** Promotes a relaxed state that keeps you sharp and alert—perfect for high-pressure workdays.
- • **Trusted Science-Backed Quality:** From Doctor’s Best, a brand with 35+ years of rigorous research and clinical validation.

## Overview

Doctor's Best Suntheanine L-Theanine offers 150 mg of pure Suntheanine per vegetarian capsule, supporting relaxation without drowsiness and enhancing mental focus. This non-GMO, gluten-free, and vegan supplement is designed for professionals seeking calm alertness during stressful days, backed by over 35 years of scientific research.

## Description

Buy Doctor's Best Suntheanine L-Theanine - 90 Vegetarian Capsules on desertcart.com ✓ FREE SHIPPING on qualified orders

## Features

- L-THEANINE SUPPLEMENT: Each capsule provides 150 mg of Suntheanine, a pure form of L-theanine (the amino acid found in green tea). It is known for its supportive role in relaxation & mental clarity
- TENSION & STRESS SUPPORT: L-theanine helps encourage a relaxed state without drowsiness, supporting a sense of calm during everyday stress while still allowing for alertness and focus
- PROMOTES FOCUS: This supplement supports cognitive performance by promoting attention and mental sharpness, beneficial for work, study, or other focus-driven activities
- 150 MG VEGGIE CAPS: Doctor's Best L-Theanine comes in convenient, easy-to-swallow veggie capsules. This formula is Non-GMO, gluten free, soy free, and vegan-friendly, fitting a variety of lifestyles
- DOCTOR'S BEST: Good nutrition starts with sound science. For over 35 years, we have been dedicated to providing only thoroughly researched, rigorously tested, and clinically-approved supplements

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B001OXTGVG |
| ASIN  | B001OXTGVG |
| Age Range Description | Adult |
| Allergen Information | Gluten Free |
| Best Sellers Rank | #11,629 in Health & Household ( See Top 100 in Health & Household ) #6 in 5-HTP Nutritional Supplements #1,116 in Sales & Deals |
| Brand Name | Doctor's BEST |
| Color | No Color |
| Container Type | Bottle |
| Customer Reviews | 4.6 4.6 out of 5 stars (2,497) |
| Date First Available  | September 1, 2009 |
| Department  | Health and Beauty>Health and Wellness |
| Diet Type | Gluten Free |
| Dosage Form | 150 |
| Flavor | Unflavored |
| Item Dimensions | 2.13 x 2.13 x 3.69 inches |
| Item Form | Capsule |
| Item Nype Name | L-Theanine |
| Item Weight | 0.06 kg |
| Item model number  | DRB-00197 |
| Manufacturer | Doctor's Best |
| Manufacturer  | Doctor's Best |
| Manufacturer Part Number | DRB-00197 |
| Material Features | Vegetarian |
| Model Name | r's Best L-Theanine Contains Suntheanine, Helps Reduce Stress & Sleep, Non-GMO, Gluten Free, Vegan, 150 mg (DRB-00197), 90 Count |
| Model Number | DRB-00197 |
| Number of Items | 1 |
| Primary Supplement Type | multivitamin |
| Product Benefits | Relaxation |
| Product Dimensions  | 2.13 x 2.13 x 3.69 inches; 2.12 ounces |
| Specific Uses For Product | L-Theanine (Suntheanine®) 150 mg |
| Total Servings Per Container | 90 |
| UPC | 753950001978 |
| Unit Count | 90 Count |

## Product Details

- **Age Range (Description):** Adult
- **Brand:** Doctor's BEST
- **Diet Type:** Gluten Free
- **Flavor:** Unflavored
- **Item Form:** Capsule
- **Item Weight:** 0.06 kg
- **Item dimensions L x W x H:** 2.13 x 2.13 x 3.69 inches
- **Primary Supplement Type:** multivitamin
- **Product Benefits:** Relaxation
- **Unit Count:** 90 Count

## Images

![Doctor's Best Suntheanine L-Theanine - 90 Vegetarian Capsules - Image 1](https://m.media-amazon.com/images/I/719zn9vom2L.jpg)

## Available Options

This product comes in different **Size** options.

## Questions & Answers

**Q: What is curcumin?**
A: Curcumin is a natural compound found in turmeric root known for its antioxidant properties and nutritional support for joint and overall wellness.*

**Q: What are the benefits of curcumin?**
A: Curcumin supports joint comfort, mobility, and antioxidant activity that helps protect cells from oxidative stress.*

**Q: Why better absorption?**
A: This formula includes BioPerine black pepper extract standardized to 95% piperine, which helps enhance curcumin absorption and bioavailability.*

**Q: Is this derived from turmeric root?**
A: Yes. The curcumin in this formula is derived from turmeric root and standardized as Curcumin C3 Complex.*

**Q: What's the daily dosage?**
A: Adults typically take 2 capsules daily with food, or as recommended by a nutritionally informed physician.*

## Frequently Bought Together

- Doctor's Best L-Theanine Contains Suntheanine, Helps Reduce Stress & Sleep, Non-GMO, Gluten Free, Vegan, 150 mg (DRB-00197), 90 Count
- Doctors BEST High Absorption Magnesium Lysinate Glycinate 100% Chelated, Muscle Relaxation & Sleep Support, Non-GMO, Gluten Free, Soy Free, Vegan, 100% Chelated 240 Tablets
- Nordic Naturals Ultimate Omega, Lemon Flavor - 90 Soft Gels - 1280 mg Omega-3 - High-Potency Omega-3 Fish Oil Supplement with EPA & DHA - Promotes Brain & Heart Health - Non-GMO - 45 Servings

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-09-03*