Glycine for Sleep: Does It Actually Help?
Glycine is a simple amino acid that has quietly built a reputation as a gentle sleep aid. The evidence is modest but encouraging, and it is inexpensive and well tolerated. Here is what to know.
Key takeaways
- Glycine is an amino acid your body uses widely, including in the nervous system.
- Small studies suggest about 3 grams before bed may improve sleep quality.
- It may help you fall asleep faster and feel more rested, without grogginess.
- It is generally well tolerated and inexpensive.
How glycine may help
Glycine acts as a calming signal in the nervous system and appears to slightly lower core body temperature, which is part of the natural process of falling asleep. That mechanism is thought to explain why some people find it helps them settle at night.
What the research shows
The evidence is limited but promising. Small studies using about 3 grams of glycine before bed have reported that people fall asleep somewhat faster, feel their sleep quality improves, and wake feeling more refreshed, without the grogginess some sleep aids cause. The research base is smaller than for melatonin, so treat it as a gentle option worth trying.
How to use it
A common approach is around 3 grams of glycine dissolved in water shortly before bed. It has a mildly sweet taste and is generally well tolerated. As with any sleep aid, pair it with consistent sleep habits, and check with a clinician if you take medication or have a health condition.
Frequently asked questions
Studies commonly use about 3 grams before bed. Start there and see how you respond.
People generally report feeling refreshed rather than groggy, which is one of its appeals, though responses vary.
It is generally well tolerated at typical doses. Check with a clinician if you are pregnant, nursing, or on medication.
References and Further Reading
How we researched this: Our editorial team reviewed current clinical research and guidance from independent health authorities before writing and reviewing this article. You can verify the science yourself through the sources below.
