What Does Glycine Do for Sleep?

Glycine is a simple amino acid — one of the building blocks of protein that your body already makes and gets from foods like bone broth and gelatin. As a supplement it's a mild, slightly sweet powder, and it's become a popular part of evening routines among people who prefer a single, recognizable ingredient over a complicated multi-ingredient sleep blend.

People typically take it in the evening as part of a wind-down ritual — a small, consistent cue that the day is closing. We won't make medical claims about it; the appeal is its simplicity and that it's naturally occurring. As with any supplement, start low and check with a professional if you take medications. More in our guide to glycine for sleep.

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