Amino acids & precursors
Taurine
3.7 (45 owner comments)
Calming effectTaste & form
“It does for me, I get jaw tension from strattera and adding taurine with my dose has made a difference”
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Amino acids & precursors · capsules
L-theanine: What People With Stress, Anxiety or Low Mood Report on Reddit
Illustration, not a product photo.
An amino acid found in tea leaves; Suntheanine is a branded form.
4.0 CalmVerdict score
330 owner comments (196 with a clear rating) from r/Supplements, r/Anxiety, r/Nootropics, r/insomnia, r/sleep, r/Stress, r/depression_help, May 2026 to October 2026. Top 13% of the 24 ranked supplements.
Owner sentiment3.5
Recommendations4.8
Tolerability4.4
ValueNot rated
Value: Not rated. The example products differ too much in dose to compare cost fairly. How we score.
The short version
L-theanine is among the better-rated supplements we track: 4.0/5. Of 196 rated owner comments, 148 were positive, 11 mixed and 37 negative; 27 mention an unwanted effect. People talk most about calming effect and side effects.
Reddit comments are self-reported and unverified. They tell you what people noticed, not whether a supplement works or is safe for you.
Read our calming amino acid guide. See what owners report about calm supplements for mood. People also compare supplements for anxiety and worry on Reddit.
What it is
- L-theanine is an amino acid found naturally in tea leaves.[PubMed]
- A 2019 randomized controlled trial gave healthy adults 200 mg a day for 4 weeks and measured stress-related symptoms; a 2020 systematic review covered L-theanine and stress and anxiety in people under stress.[PubMed][PubMed]
Safety and interactions
- Studies in the 2020 review mostly used 200 to 400 mg a day.[PubMed]
Supplements can interact with medicines. Talk to a doctor or pharmacist first, especially if you are pregnant, take prescription medicine, or have red-flag symptoms. See supplement safety and interactions.
Reports by concern
| Context | Rated owner comments | Positive | Negative | Unwanted effects |
|---|---|---|---|---|
| Anxiety & worry | 71 | 35 | 10 | 5 |
| Everyday stress | 52 | 25 | 5 | 4 |
| Low mood | 30 | 13 | 2 | 3 |
| Panic attacks | 20 | 11 | 2 | 4 |
| Physical tension | 7 | 3 | 0 | 0 |
| Rumination & intrusive thoughts | 4 | 2 | 1 | 1 |
What Reddit owners say
Commonly praised
- Calming effect: 70 owner comments
- Taste & form: 23 owner comments
- Falling asleep: 12 owner comments
Common complaints
- Side effects: 27 owner comments
- Calming effect: 8 owner comments
- Taste & form: 2 owner comments
4/5 Calming effectTaste & form“The I found a liquid L theanine and that made all the difference in the world.”
4/5 Calming effectFalling asleep“l-theanine is the only one that's worked for me.”
4/5 Side effects“I swear by L-Theanine making my social interaction flow a lot smoother.”
2/5 Calming effect“Theanine, because I had tried it for evening calm and it didn't do anything for me.”
1/5 Side effects“L-Theanine did not help me with sleep or stress, at all.”
+30 more owner comments
4/5“Supplements have helped me in the past like vitamin d, magnesium, l theanine”
4/5 Calming effect“I keep coming back to theanine but it only takes the edge off, not the whole panic spiral.”
4/5 Calming effect“Taking L Theanine consistently every morning helped me stop caring.”
4/5 Sleep depthFalling asleep“L-Theanine is beyond fantastic, it doesn't particularly help me stay asleep given its short duration but it makes me pretty sleepy between 400-800mg.”
2/5 Side effects“I've tried L-Theanine and that didn't work for me, if anything, I'm an outlier who gets paradoxical effects from it like hypnic jerks.”
4/5“L-theanine has helped me a bit, I just started supplements and can tell a difference”
1/5 Side effects“Caffeine + L-Theanine gives me unbearable headaches with high tension.”
2/5 Calming effect“For me, L theanine does nothing at 200mg.”
2/5 GrogginessSide effects“L theanine gave me a huge spike of calmness and alertness, it also completely eliminated hangovers if I took it before bed.”
4/5 Calming effect“I think it might make me tolerate caffeine a little better as I feel more calm/less anxious when taking caffeine when also taking L-theanine but that might've just been placebo.”
5/5 Calming effect“L theanine amazing for a clean calm focus / clarity.”
4/5“I take L Theanine with my anti depressant and I feel like it helps”
4/5 Mood“The one I take has l-theanine and magnesium glycinate in it too and those are both solid for mood and stress relief.”
4/5 Calming effectGrogginess“L-Theanine calms my mind alot before sleep and NAC before i drink alc heelps alot with hangovers.”
1/5 MoodSide effects“Old thread, but recently also realized that L-Theanine was significantly lowering my mood.”
4/5 Calming effectFalling asleep“Combining a low dose of theanine with melatonin occasionally is common and generally low risk, but I'd start with just one at a time to see what each actually does for you before combining them, easier to tell what's helping.”
3/5 Calming effectGrogginess“In the evenings, around 7pm, I take 200 mg of Nature's Trove L-Theanine.”
4/5 Calming effectMood“I use loose powder theanine to try different doses because I used to think theanine was bunk since 50 mg capsules did nothing.”
4/5“L theanine helped me immensely plus meditation.”
4/5“Also what works for me is L-Theanine. I started to take 3 weeks ago and is working wonderfully for me. I take about 400mg a day ( 500mg when im feeling really anxious ) usuall 200mg in the morning and 200mg when i get home from work.”
3/5 Side effects“Weird suggestion but i take mag gylcinate and L theanine.”
4/5“Anyway I started taking an L-theanine supplement and the zaps went away.”
2/5“It's not perfect, but I saw a dramatic difference when I started taking a good quality l theanine and magnesium glycinate.”
4/5“Second l-theanine it helps a lot for me.”
4/5“A mix of magnesium glycinate, Ltheanine and passion flower has helped me the most in terms of supplements.”
4/5 Calming effectStopped working“I was using l theanine at a very low dose to start like 25 mg then up to 75 mg (I'm very sensitive) at first it was very weird.”
5/5 Fast-acting“L theanine has been a total game changer in my experience.”
4/5 Calming effectSleep depth“I have found that a combination of melatonin (to help fall asleep) and L-Theanine (to help stay asleep) has worked really well for me.”
4/5“Something that helps me is literally telling myself, "Everything is okay and this is only anxiety starting to grow." I have also been taking l-theanine to help.”
2/5 Calming effect“In the past I've had a decent experience with L theanine, it isn't a miracle supplement for me, but it does take the edge off.”
Brands with their own owner reviews
- Life Extension: 4.0 from 34 owner comments
Example products
These are examples of L-theanine products sold on Amazon. They are not ranked by Reddit and the score above is for the ingredient, not a specific product. Check the label for dose and other ingredients.
Example product · not Reddit-scored
Swanson Suntheanine L-Theanine Supplement, 200 mg (60 Vegan Capsules)
$16.49 on Amazon (price as of 2026-11-03). Prices change; check Amazon for the current price.
Example product · not Reddit-scored
THORNE Theanine, 200 mg L-Theanine Supplement, 90 Capsules
$68.00 on Amazon (price as of 2026-11-03). Prices change; check Amazon for the current price.
Example product · not Reddit-scored
Life Extension L-Theanine, 200 mg, Relaxation
Brand on Reddit: 4.0 from 34 owner comments · Life Extension owner reviews
$18.00 on Amazon (price as of 2026-11-03). Prices change; check Amazon for the current price.
Example product · not Reddit-scored
Nootropics Depot L-Theanine Capsules 200mg (90 Count), Promotes Relaxation, Supports Healthy Stress Levels + Sleep Cycles
$19.99 on Amazon (price as of 2026-11-03). Prices change; check Amazon for the current price.
Research to read
Published studies (we list them so you can read the evidence yourself; inclusion is not an endorsement):
- Nutrients 2019: Effects of L-Theanine Administration on Stress-Related Symptoms and Cognitive Functions in Healthy Adults: A Randomized Controlled Trial.
- Plant Foods Hum Nutr 2020: The Effects of Green Tea Amino Acid L-Theanine Consumption on the Ability to Manage Stress and Anxiety Levels: a Systematic Review.
FAQ
What do people say about L-theanine for stress, anxiety or mood on Reddit?
Across 330 Reddit comments from people who say they have used it, 148 of 196 rated comments were positive and 37 negative, for a CalmVerdict score of 4.0/5. These are self-reported experiences, not clinical evidence.
Do people report side effects with L-theanine?
27 of 196 rated owner comments (14%) describe an unwanted effect such as drowsiness, headache, stomach upset or feeling flat. Check the safety notes on this page and ask a doctor or pharmacist before starting.
Who talks about L-theanine most?
Most rated owner comments come from people who describe anxiety or constant worry (71 comments, 35 positive).
Is L-theanine scored on clinical evidence?
No. The score summarizes Reddit owner comments only. Factual statements on this page link to NIH or PubMed sources, and nothing here is medical advice.
Related supplements
Amino acids & precursors
L-tryptophan
3.5 (6 owner comments)
MoodFeeling flat or numb
“Ive been taking l-theanine and l-tryptophan and its made a huge impact on my mental health.”
What owners report →
Amino acids & precursors
5-HTP
3.5 (21 owner comments)
MoodFeeling flat or numb
“I took about that, 900 mg 5-HTP per day, for a while.”
What owners report →Comparisons: L-theanine vs GABA · L-theanine vs Magnesium glycinate · Glycine vs L-theanine · Taurine vs L-theanine
Last updated 2026-11-04. Mentions scanned: 1125 in 717 threads.