Best Theanine for Stress & Mood
Top 10 products ranked
Last reviewed May 2026
Clinical dose: 100–250 mg
Why Theanine for Stress & Mood
Theanine plays a important role in stress & mood. L-Theanine is an amino acid found in tea leaves. It promotes relaxation without drowsiness and may support sleep quality when combined with other sleep aids.
What dose to look for
Clinical studies typically use 100–250 mg of theanine. Common supplemental range; 200 mg is the most studied single dose for relaxation and focus. Products below this range may not deliver meaningful results.
What the research says
Theanine has moderate clinical evidence for stress & mood benefits. Several clinical trials on relaxation and focus, most using 200mg; consistent but modest effects Learn more
Clinical research on L-Theanine
HIGH — 18+ RCTs, consistent subjective benefits · 200–400 mg/day (do NOT exceed 655 mg)
- •2025 meta-analysis of 18 RCTs (897 participants) found improved sleep quality (SMD=0.43, p=0.03) and daytime dysfunction (SMD=0.33, p<0.001). Objective measures (actigraphy, PSG) did not improve.
- •2024 RCT (200 mg/day, 4 weeks) reduced stress (SDS), trait anxiety (STAI), sleep disturbance (PSQI), and improved verbal fluency.
- •AlphaWave single-dose RCT (200 mg) increased alpha brain waves, reduced anxiety, and lowered salivary cortisol.
- •Mechanism: increases alpha waves and modulates GABA, serotonin, and dopamine — producing relaxation without sedation. Acute effects same day; cumulative benefits at 2–4 weeks.
NOW
L-Theanine
285 mg
Nature's Bounty
Anxiety & Stress Relief, 90 Tablets
200 mg
California Gold Nutrition
L-Theanine 200 mg
200 mg
NOW
Double Strength L-Theanine 200 mg
200 mg
Nutricost
Caffeine 100 mg with L-Theanine 100 mg
100 mg
Natrol
Sleep+ Calm Strawberry
100 mg
OLLY
Sleep Blackberry Zen
100 mg
Natural Factors
Stress-Relax Nighttime Magnesium Glycinate With Melatonin, GABA & L-Theanine
50 mg
Life Extension
Enhanced Stress Relief, 30 Vegetarian Capsules
200 mg
youtheory
Relax Magnesium Powder Berry
100 mg