Sleep supplements are widely used but evidence varies substantially. Best supplements for sleep includes options with reasonable evidence and many with limited support. For chronic insomnia, CBT-I (cognitive behavioral therapy for insomnia) is the evidence-based first-line treatment, more effective long-term than any supplement. This guide covers what works and what doesn’t. Discuss with healthcare provider.
Supplements with evidence
Melatonin: Most evidence for jet lag and shift work; modest effect on sleep onset. 0.5-3 mg taken 30-60 minutes before bed. Lower doses often more effective than high doses.
Magnesium: Some evidence, particularly for restless legs and muscle-related sleep disruption. Glycinate form preferred for sleep.
Glycine: Some evidence for sleep quality. 3 g before bed.
L-theanine: Promotes relaxation; modest sleep benefit. 200-400 mg.
Valerian: Mixed evidence. Some studies show modest benefit; others negative.
Melatonin specifics
Most effective for:
- Jet lag
- Shift work
- Delayed sleep phase syndrome
- Children with neurodevelopmental conditions (under medical guidance)
Less effective for general insomnia. Lower doses (0.5-1 mg) often more effective than high doses (5-10 mg).
Limited evidence
- Most “sleep blends” with multiple ingredients
- Chamomile (limited evidence)
- Passionflower
- GABA supplements
- 5-HTP
CBT-I — the evidence-based first-line
For chronic insomnia, CBT-I is more effective than medications or supplements long-term:
- Sleep restriction
- Stimulus control
- Cognitive restructuring
- Sleep hygiene
Available through therapists or apps (Sleepio, Somryst).
When to see a sleep specialist
- Insomnia for 3+ months
- Sleep apnea symptoms (snoring, daytime sleepiness)
- Restless legs
- Other sleep disorders suspected
Frequently Asked Questions
Is melatonin safe long-term?
Generally considered safe but long-term data limited.
What dose of melatonin should I take?
Start low (0.5-1 mg). Higher doses often less effective and can cause headaches.
Is CBT-I really better than supplements?
For chronic insomnia, yes. More durable improvements.
Can I become dependent on melatonin?
Not in classical sense, but some psychological dependence possible.
Are sleep supplements safe in pregnancy?
Generally avoided in pregnancy due to limited safety data. See our melatonin in pregnancy guide.
The bottom line on sleep supplements
Several supplements have evidence for sleep. Melatonin and magnesium most studied. CBT-I is more effective than any supplement for chronic insomnia. Discuss with healthcare provider for persistent sleep problems.