Amino acids & neurotransmitter precursors
Glycine
3.9 (281 owner comments)
Deeper sleepTaste & form
“glycine on its own was the missing piece for me for years.”
What owners report →Medical disclaimer: SnoozeVerdict summarizes what people say about sleep 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 are pregnant, take medicines (including sleep or mood medicines), or have a medical condition. Poor sleep that lasts for months, loud snoring or gasping at night, or falling asleep during the day while driving or working needs a doctor, not a supplement. Full disclaimer.
Amino acids & neurotransmitter precursors · capsules
L-tryptophan for Sleep: What People Report on Reddit
Illustration, not a product photo.
An essential amino acid and serotonin/melatonin precursor.
3.6 SnoozeVerdict score
27 owner comments (16 with a clear rating) from r/insomnia, r/Nootropics, r/sleep, r/Supplements, r/Anxiety, May 2026 to October 2026. Top 65% of the 20 rated supplements.
Owner sentiment3.8
Recommendations1.0
Tolerability4.7
ValueNot rated
Value for money: Not rated. The example products differ too much in dose to compare cost fairly. How we score.
Safety note: L-tryptophan is a serotonin precursor: same serotonin-syndrome caution as 5-HTP with SSRIs, SNRIs and MAOIs. More on safety.
The short version
L-tryptophan is rated below most supplements we track: 3.6/5. Of 16 rated owner comments, 15 were positive, 0 mixed and 1 negative; 1 mention an unwanted effect. People talk most about deeper sleep and morning grogginess.
Reddit comments are self-reported and unverified. They tell you what people noticed, not whether a supplement works or is safe for you.
Before mixing them, read how amino acid sleep aids differ. Before starting, check sleep supplement safety and interactions. People also compare supplements for deep sleep on Reddit.
What it is
- Tryptophan is an essential amino acid the body uses to make serotonin and melatonin.[PubMed]
- A 2022 meta-analysis pooled trials of tryptophan supplements and sleep quality.[PubMed]
Safety and interactions
- Same serotonin caution as 5-HTP: do not combine with SSRIs, SNRIs, MAOIs or other serotonergic drugs without a doctor.[PubMed]
- In 1989 to 1990, contaminated L-tryptophan products were linked to an outbreak of eosinophilia-myalgia syndrome.[PubMed]
Supplements can interact with medicines. Talk to a doctor or pharmacist first, especially if you are pregnant, take prescription medicine (including sleep, anxiety or antidepressant medicines), or have ongoing sleep problems. See sleep supplement safety and interactions.
Reports by sleep problem
| Context | Rated owner comments | Positive | Negative | Unwanted effects |
|---|---|---|---|---|
| Deep sleep | 3 | 3 | 0 | 0 |
What Reddit owners say
Commonly praised
- Deeper sleep: 3 owner comments
- Mood: 1 owner comment
- Falling asleep faster: 1 owner comment
Common complaints
- Morning grogginess: 1 owner comment
- Side effects: 1 owner comment
4/5 Deeper sleep“Tryptophan doesn't acutely have nootropic effects but it puts me to sleep like an exhausted child and lets me sleep more than 8 hours if needed, feeling completely recharged and refreshed every morning.”
4/5“L-tryptophan which is what makes it the most effective for me, and I'm really hard to sedate!!”
4/5“Considering buying this - I've been using 5-htp at night and its been very effective but apparently L-Tryptophan is a lot healthier for the body and mind”
2/5 Morning grogginessSide effects“L tryptophan made me groggy and headache so I have stopped.”
+9 more owner comments
4/5 Deeper sleep“Oh and tryptophan plus to improve my sleep quality.”
4/5“I'm also going to make sure I don't take it after 5pm, and take magnesium glycinate/tryptophan and lemon balm in the evening to help with sleep.”
4/5“Hey, whenever you cannot catch sleep, please try 2000mg of Agmatine combined with 2000mg of Tryptophan and 2 teaspoons of honey (preferably raw unfiltered honey).”
4/5“And I balance my increase in dopamine with 500 mg of tryptophan a couple of hours before bed.”
4/5 Mood“I was taking Tryptophan for sleep, and it worked fantastic for that”
4/5“It contains melatonin but also valerian root and L-tryptophan.”
4/5 Deeper sleep“So…rotating those things, along with 200 mg oral micronized Progesterone (I'm 66) and 500 mg of L-Tryptophan, is now my current regimen.”
4/5“Honestly no idea is Magnesuim works before bed, whats worked for me is a L-Theanine L-Tryptophan based supplement that doesn't use melatonin in it”
4/5“i started tryptophan. it helps when i bust a nut as well (actually i almost have to and its something im trying work on) gabopentin is great but dont want to be dependent”
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: 4.3 from 8 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):
- The impact of tryptophan supplementation on sleep quality: a systematic review, meta-analysis, and meta-regression. Nutr Rev 2022
- Tryptophan-induced eosinophilia-myalgia syndrome. N Engl J Med 1990
FAQ
What do people with sleep problems say about L-tryptophan on Reddit?
Across 27 Reddit comments from people who say they have used it for sleep, 15 of 16 rated comments were positive and 1 negative, for a SnoozeVerdict score of 3.6/5. These are self-reported experiences, not clinical evidence.
Do people report side effects with L-tryptophan?
1 of 16 rated owner comments (6%) describe an unwanted effect such as grogginess, headaches, vivid dreams or an upset stomach. 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 talk about deep or restful sleep (3 comments, 3 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 & neurotransmitter precursors
L-theanine
3.8 (333 owner comments)
CalmingFalling asleep faster
“I've been taking l-theanine for like 8 years now, no side effects, withdrawls when I stop, or anything negative from it at all.”
What owners report →
Amino acids & neurotransmitter precursors
5-HTP
3.7 (37 owner comments)
Deeper sleepFalling asleep faster
“I take tyrosine daily but I only take 5-htp once in a while on a weekend where I can sleep in a bit longer.”
What owners report →Comparisons: 5-HTP vs L-tryptophan
Last updated 2026-11-04. Mentions scanned: 143 in 120 threads.