Theanine
15 benefits mapped to clinical evidence across supplements.
Benefit Evidence
Anxiety, sAA ↓
BP stress response ↓
Cortisol, anxiety ↓
Anxiety↓; sAA↓
Stress markers↓; BP↓
Anxiety↓; HR↓
Mood: +
Anxiety/stress: −
Lower anxiety/stress
Mood lift +56%
Less stress markers
↓ physiological stress
↓ anxiety/stress -17 to 22
↓ cortisol/HRV response
Lower anxiety/stress markers
Reduced stress response
Sleep quality + duration
Deep sleep +50%
Sleep onset −24 min
Sleep quality improved
Attention speed+accuracy
Fatigue/stress down
Attention + fast RT
Working memory + accuracy
Alertness, -tiredness
Attention/working memory up
+1.8 memory points
Caffeine combo boosts memory
Attention/working memory ↑
Memory recall modest ↑
Faster attention RTs
Better ERP attention
+38 ms
faster, sharper attention
−30 to −150 ms
Alertness/attention +accuracy
Fatigue/stress - sAA, +sleep
Alertness, less fatigue
Reaction time, +15–20 ms
Anxiety, sAA ↓
BP stress response ↓
Cortisol, anxiety ↓
Anxiety↓; sAA↓
Stress markers↓; BP↓
Anxiety↓; HR↓
Mood: +
Anxiety/stress: −
Lower anxiety/stress
Mood lift +56%
Less stress markers
↓ physiological stress
↓ anxiety/stress -17 to 22
↓ cortisol/HRV response
Lower anxiety/stress markers
Reduced stress response
Sleep quality + duration
Deep sleep +50%
Sleep onset −24 min
Sleep quality improved
Attention speed+accuracy
Fatigue/stress down
Attention + fast RT
Working memory + accuracy
Alertness, -tiredness
Attention/working memory up
+1.8 memory points
Caffeine combo boosts memory
Attention/working memory ↑
Memory recall modest ↑
Faster attention RTs
Better ERP attention
+38 ms
faster, sharper attention
−30 to −150 ms
Alertness/attention +accuracy
Fatigue/stress - sAA, +sleep
Alertness, less fatigue
Reaction time, +15–20 ms
Similar by evidence
Supplements the same benefits carry qualifying findings for — a fact about the evidence graph, not a recommendation to swap.
Products with Theanine
Search all259 products whose verified label declares Theanine — not every bottle that mentions it in a title.
Being studied right now
Recruiting clinical trials registered on ClinicalTrials.gov. A trial in progress has no result yet — this is what the field is asking, not what it found.