Natural sleep supplements: what does the evidence say?

How to read this page

Each summary restates what the guide found. None of them says what to take, and none says a supplement works. The strongest recommendation in the clinical guidelines we cite for chronic insomnia is not a supplement. The American College of Physicians and the American Academy of Sleep Medicine give cognitive behavioral therapy for insomnia a strong recommendation. Our guide on waking up at night goes through it.

To see the ingredients side by side, ranked by the strength of the evidence with the doses studied, read best natural sleep supplements, ranked by the evidence.

Last reviewed September 19, 2026.

The ingredients

Melatonin

For people with primary sleep disorders, pooled trials show a small average effect: about 7 minutes faster to fall asleep and 8 minutes more sleep. For chronic insomnia in adults, the American Academy of Sleep Medicine suggests clinicians not use it (a weak recommendation). The case is better for jet lag and delayed sleep-wake phase disorder. Measured melatonin in supplements has ranged from 83% below to 478% above the label.

GABA

The best pooled review found limited evidence for stress and very limited evidence for sleep. The few sleep trials were small and mostly found a shorter time to fall asleep. Whether swallowed GABA reaches the brain is unsettled.

L-theanine

Pooled analyses find small improvements in self-reported sleep, with wide uncertainty, and inconsistent effects on anxiety. A good deal of the research is tied to a maker of the ingredient.

Magnesium glycinate

A 2026 review of 12 trials rated the certainty of the evidence low to very low and does not support routine use for insomnia. The one trial of magnesium bisglycinate found a small effect at 250 mg of elemental magnesium a day.

5-HTP

We found no placebo-controlled trial of 5-HTP alone in adults with insomnia. The main questions are about safety: interactions with medicines that affect serotonin, and a contested contamination history.

Apigenin

We found no human trial of apigenin alone. The sedative-like effects come from mice and rats, and chamomile trials, which contain apigenin among other compounds, gave mixed results.

Lemon balm

The sleep evidence is small trials, several of them of combinations. A placebo-controlled trial of a combination found no benefit, and results depend on the preparation.

Tart cherry

Small early trials were positive on some measures. The two newest placebo-controlled trials we read found no effect.

Vitamins B6 and B2

We found no trial of either alone showing better sleep in adults with insomnia. B6 increased dream recall in small studies, and the NIH sets an upper limit for it of 100 mg a day.

Related science

Two guides explain how the body regulates sleep: sleep pressure and the circadian rhythm. A third looks at cortisol and sleep.

Why these ten ingredients

They are the ten ingredients in Yu Sleep, a liquid supplement we review. We started with them because its label lists them. Our guides on Yu Sleep contain affiliate links, and so do the ingredient guides above, each at a button near the end. The affiliate disclosure has the full terms.

Before you take anything

We are an editorial team, not doctors or pharmacists, and nothing here is medical advice. Supplements can interact with medicines, and some have safety questions the guides describe. If sleep trouble is persistent, or you take any medication, talk to a healthcare provider.