---
product_id: 1864778
title: "Doctor's Best L-Theanine Contains Suntheanine, Helps Reduce Stress & Sleep, Non-GMO, Gluten Free, Vegan, 150 mg (DRB-00197), 90 Count"
brand: "doctor's best"
price: "R722"
currency: ZAR
in_stock: true
reviews_count: 8
category: "Doctor's Best"
url: https://www.desertcart.co.za/products/1864778-doctors-best-l-theanine-contains-suntheanine-helps-reduce-stress-sleep
store_origin: ZA
region: South Africa
---

# Non-GMO, vegan & gluten-free Supports focus & mental clarity 150 mg Suntheanine per capsule Doctor's Best L-Theanine Contains Suntheanine, Helps Reduce Stress & Sleep, Non-GMO, Gluten Free, Vegan, 150 mg (DRB-00197), 90 Count

**Brand:** doctor's best
**Price:** R722
**Availability:** ✅ In Stock

## Summary

> 🌿 Calm mind, sharp edge — own your day with Doctor’s Best L-Theanine!

## Quick Answers

- **What is this?** Doctor's Best L-Theanine Contains Suntheanine, Helps Reduce Stress & Sleep, Non-GMO, Gluten Free, Vegan, 150 mg (DRB-00197), 90 Count by doctor's best
- **How much does it cost?** R722 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.za](https://www.desertcart.co.za/products/1864778-doctors-best-l-theanine-contains-suntheanine-helps-reduce-stress-sleep)

## 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

- • **Easy Daily Ritual:** Convenient veggie capsules designed for effortless integration into your wellness routine
- • **Pure Suntheanine Power:** 150 mg of clinically studied L-Theanine for calm focus without drowsiness
- • **Stress-Free Productivity:** Promotes relaxation and mental sharpness to tackle your busiest days
- • **Clean & Conscious Formula:** Non-GMO, gluten-free, soy-free, and 100% vegan-friendly capsules
- • **Trusted Science-Backed Brand:** Over 35 years of rigorous testing and clinical approval for your peace of mind

## Overview

Doctor's Best L-Theanine delivers 150 mg of patented Suntheanine per vegan capsule, promoting relaxation, stress reduction, and enhanced focus without causing drowsiness. This non-GMO, gluten-free, and soy-free supplement supports mental clarity and calm alertness, making it ideal for professionals seeking balanced productivity and restful sleep. Backed by over 35 years of scientific research, it’s a trusted, clean formula designed for daily use.

## Description

At Doctor’s Best, we understand that stress can be an unwelcome guest. That is why our specialized formula features a pure form of L-theanine that is renowned for promoting relaxation, managing stress, and sharpening focus for a more balanced state of mind.*

Review: Very good NON-hormonal OTC supplement that promotes relaxation at bedtime. - I find this particular formulation of L-Theanine to be a very good adjunct to help me fall asleep and stay asleep. This formula by the Doctor's Best brand has "Suntheanine," which is a patented form of the amino acid L-Theanine known to promote relaxation. I've taken this formula steadily for about a year at bedtime with only good results as part of an overall sleep hygiene routine that also includes listening to a Calm sleep story on the app in my phone, next to my bed. Also why I like this particular formulation is that it has just 150 mg of the Suntheanine/L-theanine in it, which is less than most other formulas on the market. IMO, less of something often translates to "more." I don't know how long it stays in the system, but probably not for very long, because I wake up normally, with no leftover drowsiness. Another reason why I like this supplement is because it's NON-hormonal. Some folks use melatonin to promote sleep, but I've always avoided that, since melatonin is a hormone, and from what I understand, it's not meant to be used long-term. For me, this has performed as a safe and effective over-the-counter sleep aid. As of December 2025, it was still reasonably priced.
Review: Great for anxiety - Really does work for anxiety, as someone who suffers from anxiety and been on a lot of prescription medication thus L-Theanine is almost as good, take as directed and give it some time, helped me during a Benzo taper.

## 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 |
| Age Range Description | Adult |
| Allergen Information | Gluten Free |
| Best Sellers Rank | #9,370 in Health & Household ( See Top 100 in Health & Household ) #1,047 in Sales & Deals |
| Brand | Doctor's BEST |
| Brand Name | Doctor's BEST |
| Color | No Color |
| Container Type | Bottle |
| Customer Reviews | 4.5 out of 5 stars 2,451 Reviews |
| 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 Kilograms |
| Manufacturer | Doctor's Best |
| 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 |
| Number of Items | 1 |
| Primary Supplement Type | multivitamin |
| Product Benefits | Relaxation |
| 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 Kilograms
- **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 L-Theanine Contains Suntheanine, Helps Reduce Stress & Sleep, Non-GMO, Gluten Free, Vegan, 150 mg (DRB-00197), 90 Count - Image 1](https://m.media-amazon.com/images/I/719zn9vom2L.jpg)
![Doctor's Best L-Theanine Contains Suntheanine, Helps Reduce Stress & Sleep, Non-GMO, Gluten Free, Vegan, 150 mg (DRB-00197), 90 Count - Image 2](https://m.media-amazon.com/images/I/71sgtOZHpaL.jpg)
![Doctor's Best L-Theanine Contains Suntheanine, Helps Reduce Stress & Sleep, Non-GMO, Gluten Free, Vegan, 150 mg (DRB-00197), 90 Count - Image 3](https://m.media-amazon.com/images/I/7148WPNqAdL.jpg)
![Doctor's Best L-Theanine Contains Suntheanine, Helps Reduce Stress & Sleep, Non-GMO, Gluten Free, Vegan, 150 mg (DRB-00197), 90 Count - Image 4](https://m.media-amazon.com/images/I/718tvAljfML.jpg)
![Doctor's Best L-Theanine Contains Suntheanine, Helps Reduce Stress & Sleep, Non-GMO, Gluten Free, Vegan, 150 mg (DRB-00197), 90 Count - Image 5](https://m.media-amazon.com/images/I/71VeMfCGfbL.jpg)

## Questions & Answers

**Q: How do you choose between their Suntheanine and their 5-HTP? Both seem to do the same thing.**
A: 5-HTP is the tryptophan-based intermediate to serotonin which most antidepressants work to increase or support.
It's more specifically targets serotonin, needed for a balanced mood.

Suntheanine, a patented and advanced form of L-Theanine, has a broader range of psychotherapeutic and neuro- cognitive benefits than does 5-HTP.

It works as an anti-anxiety from multiple paths. 1) It supports the levels of gaba to calm the brain 2)It blocks glutamate receptors in the brain from receiving an excitatory neurotrans-mitter 3) It induces Alpha Waves in the brain.

Additionally, as a small molecule powerful antioxidant, it crosses the blood brain barrier to reach neurons directly where it fight oxidation in them. 

This gives it the ability to fight or offer benefit against a wide range of age-related neuro-cognitive conditions such as memory loss, learning impairments, attention deficits, dementia, Alzheimer's etc.

**Q: Has anyone taken Suntheanine by opening the capsules and adding to liquid?  If so, how is the taste?**
A: My daughter, after first asking the doctor if it was safe, decided to try it with her Autistic child.  Since she can't swallow pills, my daughter opens the capsule and places it into applesauce or a similar food.   It still seems effective and my grandchild didn't seem to mind or notice any bad taste.  So, I assume if it can be placed in food, it should be fine to also place it in a liquid.  I hope this has helped you with your questions.

**Q: I see some theanine comes from China. I would prefer one produced in the USA. Does any ingrediant in this come from China?**
A: What is the country of origin for Doctor's Best products?Doctor's Best products are quality tested and manufactured in the United States using highly qualified cGMP manufacturers and raw material ingredients. Doctor's Best sources raw materials from around the world and ingredients are subject to the intense testing and verification regardless of geography of origin.- See more at: http://www.drbvitamins.com/products/suntheanine-l-theanine-150mg/drb-00197#sthash.wAlbJQD6.dpuf

**Q: Does this contain caffiene?**
A: It doesn't state anywhere on the bottle that it contains caffeine. I'm not sure, you will have to investigate further.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Very good NON-hormonal OTC supplement that promotes relaxation at bedtime.
*by M***4 on December 28, 2025*

I find this particular formulation of L-Theanine to be a very good adjunct to help me fall asleep and stay asleep. This formula by the Doctor's Best brand has "Suntheanine," which is a patented form of the amino acid L-Theanine known to promote relaxation. I've taken this formula steadily for about a year at bedtime with only good results as part of an overall sleep hygiene routine that also includes listening to a Calm sleep story on the app in my phone, next to my bed. Also why I like this particular formulation is that it has just 150 mg of the Suntheanine/L-theanine in it, which is less than most other formulas on the market. IMO, less of something often translates to "more." I don't know how long it stays in the system, but probably not for very long, because I wake up normally, with no leftover drowsiness. Another reason why I like this supplement is because it's NON-hormonal. Some folks use melatonin to promote sleep, but I've always avoided that, since melatonin is a hormone, and from what I understand, it's not meant to be used long-term. For me, this has performed as a safe and effective over-the-counter sleep aid. As of December 2025, it was still reasonably priced.

### ⭐⭐⭐⭐⭐ Great for anxiety
*by D***N on January 19, 2026*

Really does work for anxiety, as someone who suffers from anxiety and been on a lot of prescription medication thus L-Theanine is almost as good, take as directed and give it some time, helped me during a Benzo taper.

### ⭐⭐⭐⭐⭐ Smooth focus without jitters
*by K***V on September 18, 2025*

This supplement really helps with calm focus. I take it in the morning with coffee and it removes any nervous edge from caffeine. Clean product, no aftertaste, works exactly as expected.

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*Product available on Desertcart South Africa*
*Store origin: ZA*
*Last updated: 2026-02-25*