Amino acids & precursors
L-theanine
4.0 (330 owner comments)
Calming effectSide effects
“The I found a liquid L theanine and that made all the difference in the world.”
What owners report →Medical disclaimer: CalmVerdict summarizes what people say about supplements on Reddit. It is not medical advice, and nothing here is meant to diagnose, treat, cure, or prevent any disease. These statements have not been evaluated by the Food and Drug Administration. Talk to your doctor or pharmacist before starting a supplement, especially if you take an antidepressant or other medicine, are pregnant, or have a medical condition. Do not stop or change prescribed medicine on your own. If you are in crisis or thinking about suicide, call or text 988 (US) or your local emergency number. Full disclaimer.
Amino acids & precursors · capsules
L-tryptophan: What People With Stress, Anxiety or Low Mood Report on Reddit
Illustration, not a product photo.
An essential amino acid and serotonin/melatonin precursor.
3.5 CalmVerdict score
6 owner comments (6 with a clear rating) from r/Supplements, r/Nootropics, r/sleep, May 2026 to October 2026. Top 46% of the 24 ranked supplements.
Owner sentiment4.0
Recommendations1.0
Tolerability4.3
ValueNot rated
Value: Not rated. The example products differ too much in dose to compare cost fairly. How we score.
The short version
L-tryptophan is rated about average among the supplements we track: 3.5/5. Of 6 rated owner comments, 6 were positive, 0 mixed and 0 negative; 1 mention an unwanted effect. People talk most about mood and feeling flat or numb.
Reddit comments are self-reported and unverified. They tell you what people noticed, not whether a supplement works or is safe for you.
Before combining, see which supplements raise serotonin. Read what owners say about onset and timing. See what owners report about calm supplements for mood.
What it is
- L-tryptophan is an essential amino acid from food that the body uses to make serotonin and melatonin. A 2021 systematic review looked at tryptophan supplements and mood.[PubMed]
Safety and interactions
- Like 5-HTP, it raises serotonin: do not combine it with SSRIs, SNRIs, MAOIs or other serotonin-affecting drugs without your doctor (risk of serotonin syndrome).[MedlinePlus]
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 and serotonin supplements and antidepressants.
Reports by concern
| Context | Rated owner comments | Positive | Negative | Unwanted effects |
|---|---|---|---|---|
| Low mood | 4 | 4 | 0 | 1 |
What Reddit owners say
Commonly praised
- Mood: 4 owner comments
- Feeling flat or numb: 1 owner comment
- Stopped working: 1 owner comment
Common complaints
- Side effects: 1 owner comment
4/5 MoodTakes time“Ive been taking l-theanine and l-tryptophan and its made a huge impact on my mental health.”
4/5 Mood“I was taking Tryptophan for sleep, and it worked fantastic for that”
5/5“For me it has been L tryptophan. Has been a game changer for me I take 440mg 3 times a day and it has been great. I also have ocd and thats all I take.”
Example products
These are examples of L-tryptophan 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
NOW Supplements, L-Tryptophan 500 mg, Supports Relaxation*
$10.99 on Amazon (price as of 2026-11-03). Prices change; check Amazon for the current price.
Example product · not Reddit-scored
Life Extension L-Tryptophan 500 mg, Sleep, 90 Capsules
Brand on Reddit: 4.0 from 34 owner comments · Life Extension owner reviews
$24.75 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):
- J Diet Suppl 2021: A systematic review of the effect of L-tryptophan supplementation on mood and emotional functioning.
- Cochrane Database Syst Rev 2002: Tryptophan and 5-hydroxytryptophan for depression.
FAQ
What do people say about L-tryptophan for stress, anxiety or mood on Reddit?
Across 6 Reddit comments from people who say they have used it, 6 of 6 rated comments were positive and 0 negative, for a CalmVerdict score of 3.5/5. These are self-reported experiences, not clinical evidence.
Do people report side effects with L-tryptophan?
1 of 6 rated owner comments (17%) 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-tryptophan most?
Most rated owner comments come from people who describe low mood or depression (4 comments, 4 positive).
Is L-tryptophan 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
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”
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: 5-HTP vs L-tryptophan
Last updated 2026-11-04. Mentions scanned: 39 in 34 threads.