Glycine
Three small trials. One had 7 men.
Grade B: Some human proof
Small, early or mixed results in people.
The grade is for the use people talk about, not for every use. Filed under: Sleep and stress.
How it works
An amino acid the body also uses as a calming nerve signal.
How it was given in studies
By mouth. In the trials people swallowed it as a capsule, tablet, powder or drink.
This is what the studies did. It is not a how-to.
What studies saw
Three small trials each found some benefit. In one, 7 sleep-restricted men felt less tired the next day.
The trade-off
Very little research. One trial was run by a single company on its own employees.
When it showed up, in studies
Less next-day tiredness after one night, in a 7-man trial.
Sources
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Keep going
We show what studies found. We never tell you what to take. Doses vary by study. Check the sources and talk to a doctor.