ProveIt Supplements

Independent, evidence-based supplement analysis.

✓ Not Sponsored

✓ No Paid Reviews

✓ Science-Based

Company

  • About Us
  • Our Methodology
  • Contact
  • Blog
  • Authors
  • Partners

Legal

  • Privacy Policy
  • Terms of Service
  • Medical Disclaimer
  • Affiliate Disclosure

Resources

  • All Categories
  • Ingredient Database
  • Browse Supplements
  • FAQ

© 2026 ProveIt Supplements. All rights reserved.

Medical Disclaimer: The information provided is for educational purposes only and is not intended as medical advice. Always consult with a qualified healthcare professional before starting any supplement regimen.

Prove It
Browse SupplementsBlogAuthorsAboutMethodologyFAQ
Get Your Personalized Supplement StackSupplement Stack Quiz
Menu
HomeBrowse SupplementsBlogAuthorsAboutMethodologyFAQ
L-Theanine 200mg

L-Theanine 200mg

GNC

#Sleep Aid
83
Safety85
Efficacy80
Transparency85
Based on Examine, Wikipedia, and 23 other sources

Overview

GNC L-Theanine provides a clinically effective dose of a well-researched ingredient known for its calming and cognitive-enhancing properties. The use of Suntheanine ensures a high-purity form of L-Theanine, supporting consistent efficacy. While generally well-tolerated, it's important to consider potential interactions with medications and individual variability in response.

The Good

Significant reduction in anxiety and stress levels documented

Improvements in sleep quality, especially for individuals with ADHD

Cognitive enhancements, notably in attentional tasks

The Bad

May interact with antidepressants or antipsychotics

Limited safety data for pregnant and breastfeeding women

Potential impact on individuals with mental health conditions

Is it for you?

Best For: Individuals seeking stress relief, improved focus, better sleep quality

Skip If: You are pregnant, nursing, or taking sedative medications without consulting a doctor

Ingredients Analysis

Suntheanine L-Theanine

200 mg

How to Use

Take one capsule daily. Consult a healthcare professional for personalized dosage.

Frequency:

Daily

Best Time:

Anytime, especially evening

When:

With or without food

Who Should Use This

Best For:

Individuals seeking stress relief, improved focus, better sleep quality

Recommended Articles

L-Theanine Dosage for Focus: Avoid Drowsiness

L-Theanine Dosage for Focus: Avoid Drowsiness

200-400mg daily of L-theanine enhances focus without causing drowsiness, with benefits amplified when combined with caffeine.

Safe Energy Supplement Ingredients for Daily Use

Safe Energy Supplement Ingredients for Daily Use

Caffeine, when consumed in doses up to 400mg per day, is a safe and effective ingredient in energy supplements for healthy adults.

Best Sleep Supplements: Ingredients & Doses

Best Sleep Supplements: Ingredients & Doses

Melatonin (0.5-5 mg) and Valerian root (300-600 mg) are highly recommended for improving sleep quality.

Avoiding Stimulants: A Guide for Sensitive Individuals

Avoiding Stimulants: A Guide for Sensitive Individuals

Identify stimulant ingredients to avoid, understand their effects, discover alternatives, and learn label-reading tips for sensitivity.