All Supplements
L-Theanine vs Glycine
Side-by-side comparison — benefits, dosage, forms, and research.
Feature
L-Theanine
Glycine
Typical Dosage
100-200mg daily
3-5g daily
Best Form
L-Theanine (Suntheanine)
Powder
Key Benefits
5
6
Evidence Rating
★★★★
★★★★
Best Time
With caffeine for focus, or evening for relaxation
Evening for sleep benefits; anytime for general health
L-Theanine Benefits
✓Calm focus without sedation
✓Reduces caffeine jitters when combined
✓Promotes alpha brain waves (relaxed alertness)
✓May improve sleep quality
✓Anxiety reduction
Glycine Benefits
✓Improves sleep quality and sleep onset
✓Supports collagen formation and joint health
✓Enhances cognitive function and memory
✓Reduces muscle wasting and supports muscle recovery
✓Promotes relaxation and reduces anxiety
✓Supports immune function
Can You Take Both Together?
In most cases, L-Theanine and Glycine can be taken together safely. However, always check the interactions section of each supplement and consult a healthcare professional if you take medication.
Which Should You Choose?
Choose L-Theanine if your primary goal is: calm focus without sedation. Choose Glycine if your primary goal is: improves sleep quality and sleep onset. Many people take both as they target different aspects of health.
Disclaimer: This comparison is for educational purposes only. Always consult a healthcare professional before starting any supplement.