Melatonin can be helpful for some people, but "natural" doesn't automatically mean it's safe or appropriate for long-term daily use.
Here's what the evidence suggests:
- For short-term use: Melatonin is generally considered safe for most healthy adults when used for a few days to a few weeks. It's commonly used for jet lag, shift work, or temporarily adjusting sleep schedules.
- For daily, long-term use: Studies suggest melatonin is generally well tolerated for months and, in some cases, longer. However, there is less high-quality evidence on very long-term daily use, especially over many years. Whether it's appropriate depends on why you're taking it.
Common side effects
Most side effects are mild and may include:
- Daytime sleepiness
- Headache
- Dizziness
- Nausea
- Vivid dreams
Potential concerns
Melatonin can interact with certain medications, including:
- Blood thinners
- Some diabetes medications
- Blood pressure medications
- Immunosuppressants
- Certain antidepressants and seizure medications
It may also not be appropriate for everyone, such as people with certain autoimmune conditions or those who are pregnant or breastfeeding, unless advised by a healthcare professional.
Dose matters
Many over-the-counter melatonin products contain much higher doses than many people need.
- A low dose (around 0.3–1 mg) is often enough for many people.
- Higher doses (3–10 mg or more) don't necessarily work better and may increase side effects.
If you're relying on it every night
If you find you need melatonin nightly for more than a few weeks, it's worth considering whether an underlying issue is affecting your sleep, such as:
- Stress or anxiety
- An inconsistent sleep schedule
- Sleep apnea
- Restless legs syndrome
- Certain medications or medical conditions
Treating the underlying cause is often more effective than taking a sleep aid indefinitely.
Other "natural" sleep aids
The evidence for other supplements is generally weaker:
- Magnesium: May help some people, particularly if they're deficient, but isn't a proven sleep aid for everyone.
- Valerian root: Mixed evidence; may cause drowsiness or stomach upset.
- Chamomile: Generally safe as a tea, though evidence for improving insomnia is limited.
- Lavender: Some people find the aroma relaxing, but effects on sleep quality are modest.
If your main concern is difficulty falling asleep, staying asleep, or waking too early, I can suggest the approaches that tend to work best for each type of sleep problem.
