All Supplements
Glycine vs L-Theanine
Side-by-side comparison — benefits, dosage, forms, and research.
Feature
Glycine
L-Theanine
Typical Dosage
3-5g daily
100-200mg daily
Best Form
Powder
L-Theanine (Suntheanine)
Key Benefits
6
5
Evidence Rating
★★★★
★★★★
Best Time
Evening for sleep benefits; anytime for general health
With caffeine for focus, or evening for relaxation
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
L-Theanine Benefits
✓Calm focus without sedation
✓Reduces caffeine jitters when combined
✓Promotes alpha brain waves (relaxed alertness)
✓May improve sleep quality
✓Anxiety reduction
Can You Take Both Together?
In most cases, Glycine and L-Theanine 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 Glycine if your primary goal is: improves sleep quality and sleep onset. Choose L-Theanine if your primary goal is: calm focus without sedation. 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.