Supplements for trouble falling asleep

Written to our editorial standards · reviewed against published research· Updated 2 Jun 2026
Sleep

Difficulty falling asleep is commonly eased by magnesium glycinate, glycine, and a low dose of melatonin, alongside a consistent wind-down.

Magnesium relaxes muscle and a wired nervous system, glycine gently lowers core body temperature to cue sleep, and melatonin is a timing signal that shortens how long it takes to drop off. L-theanine takes the edge off racing, anxious thoughts at bedtime.

Nutrients commonly linked

Magnesium Glycinate
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Glycine
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Melatonin
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L-Theanine
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Biomarkers worth checking

These are the blood tests most relevant here. Knowing your numbers tells you whether a supplement is the right answer.

Magnesium (serum)Vitamin D (25-OH)
When to see a doctor

See a doctor if insomnia is persistent, or comes with low mood, loud snoring, or daytime sleepiness, since these point to causes supplements will not fix.

Beyond supplements

A fixed wake time, morning light, a cool dark room, and no screens or caffeine late are the foundation; supplements assist, they do not replace it.

Common questions

What supplements help with trouble falling asleep?
Difficulty falling asleep is commonly eased by magnesium glycinate, glycine, and a low dose of melatonin, alongside a consistent wind-down. The nutrients most often linked are Magnesium Glycinate, Glycine, Melatonin, L-Theanine.
Which deficiencies are associated with trouble falling asleep?
Magnesium relaxes muscle and a wired nervous system, glycine gently lowers core body temperature to cue sleep, and melatonin is a timing signal that shortens how long it takes to drop off. L-theanine takes the edge off racing, anxious thoughts at bedtime.
When should I see a doctor about trouble falling asleep?
See a doctor if insomnia is persistent, or comes with low mood, loud snoring, or daytime sleepiness, since these point to causes supplements will not fix.

Explore further

Find out what's actually low

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Educational use only, not medical advice, diagnosis, or treatment. Symptoms have many possible causes, and the nutrients here are commonly associated with this symptom, not a guaranteed fix. Always consult a qualified clinician, especially if symptoms are severe, persistent, or new.