All Supplements
L-Theanine vs L-Arginine
Side-by-side comparison — benefits, dosage, forms, and research.
Feature
L-Theanine
L-Arginine
Typical Dosage
100-200mg daily
2-3g per day
Best Form
L-Theanine (Suntheanine)
L-Arginine HCl
Key Benefits
5
5
Evidence Rating
★★★★
★★★
Best Time
With caffeine for focus, or evening for relaxation
30-60 minutes before exercise or with meals
L-Theanine Benefits
✓Calm focus without sedation
✓Reduces caffeine jitters when combined
✓Promotes alpha brain waves (relaxed alertness)
✓May improve sleep quality
✓Anxiety reduction
L-Arginine Benefits
✓Enhanced blood flow and circulation
✓Cardiovascular health support
✓Improved exercise performance
✓Wound healing and tissue repair
✓Immune system support
Can You Take Both Together?
In most cases, L-Theanine and L-Arginine 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 L-Arginine if your primary goal is: enhanced blood flow and circulation. 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.