L-theanine vs Glycine
On Reddit, owners rate Glycine higher overall (3.9 vs 3.8). Scores summarize self-reported experiences and are not evidence that either will work for you.
| L-theanine | Glycine | |
|---|---|---|
| Type | capsules | powder or capsules |
| SnoozeVerdict score | 3.8 | 3.9 |
| Owner sentiment | 3.6 | 3.7 |
| Recommendations | 3.4 | 3.4 |
| Tolerability | 4.4 | 4.5 |
| Owner comments | 333 | 281 |
| Rated comments | 173 | 143 |
| Unwanted effects reported | 14% | 10% |
| Top praise | Dose & timing, Calming | Dose & timing, Deeper sleep |
| Top complaints | Side effects, Dose & timing | Side effects, Dose & timing |
By sleep problem
| Context | L-theanine | Glycine |
|---|---|---|
| Falling asleep | 23 of 27 positive | 8 of 11 positive |
| Staying asleep | 10 of 11 positive | 9 of 14 positive |
| Morning grogginess | 3 of 15 positive | 2 of 4 positive |
| Deep sleep | 15 of 16 positive | 20 of 22 positive |
| Anxiety at night | 6 of 8 positive | 1 of 3 positive |
| Vivid dreams | 1 of 4 positive | Too few comments |
Before mixing them, read how amino acid sleep aids differ. Still comparing? Browse every sleep supplement we track, sorted by Reddit owner score. For quick shortlists by sleep problem, see which sleep supplements Reddit rates highest.
What owners say about L-theanine
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.”
4/5 Taste & form“I also recommend breaking 200mg pills into quarters, and try taking l-theanine with it.”
4/5 Deeper sleep“You're not gonna feel anything like L-theanine, glycinate is so subtle I forgot I took it until I realized I slept through the night without waking up at 3am.”
What owners say about Glycine
4/5 Deeper sleep“glycine on its own was the missing piece for me for years.”
5/5 Taste & form“Glycine is what I swear by. One teaspoon with green tea in the morning and one before sleep. I took it primarily for collagen but with time noticed the effect of calmness, it is now harder for me to become agitated and stressed.”
2/5 Side effects“i experience a paradoxical effect to glycine, it gives me extreme anxiety & insomnia.”
Talk to a doctor or pharmacist before switching or combining supplements, particularly if you take other medicines.