Best Amino Acid Supplement for Falling Asleep: What Reddit Owners Report
Among amino acid supplement options, L-theanine has the best reports from people who struggle to fall asleep: 23 of 27 rated owner comments were positive. We rank by a context rating that pulls small samples toward the average, so a handful of glowing comments cannot top the list. Only options with at least 5 rated comments in this context are ranked. This is a summary of self-reports, not a recommendation, and it is not evidence that any of them works for you.
| # | Supplement | Context rating | Rated comments here | Positive | Negative | Unwanted effects | Overall score |
|---|---|---|---|---|---|---|---|
| 1 | L-theanine | 3.8 | 27 | 23 | 2 | 0 | 3.8 |
| 2 | Glycine | 3.7 | 11 | 8 | 2 | 0 | 3.9 |
Also mentioned, but with fewer than 5 rated comments in this context (not ranked): 5-HTP, L-tryptophan, Taurine, GABA.
Why each ranks where it does
1. L-theanine
23 positive and 2 negative out of 27 rated comments from people who struggle to fall asleep; 85% positive. See L-theanine side effects. How people take it: L-theanine dosage and timing.
4/5 Falling asleep fasterTaste & form“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.”
2/5“Unfortunately I took l theanine out of desperation last night and I've read you have to go complete cold turkey on it for at least 10-15 days to return back to normal.”
2. Glycine
8 positive and 2 negative out of 11 rated comments from people who struggle to fall asleep; 73% positive. See Glycine side effects. How people take it: Glycine dosage and timing.
4/5 Falling asleep faster“I take 3g before bed with mag glycinate, and that double-tap on my glycine receptors really helps me fall asleep”
Safety notes
- L-theanine: Supplements can interact with medicines and are not reviewed by the FDA for safety before they are sold; tell your doctor or pharmacist about anything you take.[NIH Office of Dietary Supplements]
Check interactions with a pharmacist before starting, and see a doctor about new or severe symptoms.
Example L-theanine products
Examples sold on Amazon, not ranked by Reddit. The score above is for the ingredient, not these products.
Swanson Suntheanine L-Theanine Supplement, 200 mg (60 Vegan Capsules), Double-potency supplements
THORNE Theanine, 200 mg L-Theanine Supplement, 90 Capsules
Keep comparing
- All supplement types for this sleep problem: Falling Asleep: full ranking
- L-theanine vs Glycine
- Does melatonin help you fall asleep?
- Does magnesium glycinate help you fall asleep?
- Does magnesium help you fall asleep?
- Does L-theanine help you fall asleep?
- Background: Amino Acids for Sleep
- Best Magnesium for Falling Asleep
- Best Amino Acid Supplement for Deep Sleep and Sleep Quality