Melatonin is a hormone naturally produced by the pineal gland in the brain. It plays a crucial role in regulating the body's circadian rhythm—the natural sleep-wake cycle¹². Darkness triggers the production of melatonin, signaling the body that it is time to sleep, while light inhibits its production, signaling wakefulness³.

Melatonin supplements are synthesized in laboratories and are commonly used to manage sleep disorders such as insomnia and jet lag⁴. These supplements are often taken to help individuals fall asleep faster or adjust to new sleep schedules due to travel or shift work⁵.

While melatonin is generally considered safe with a low risk of adverse effects, it can cause side effects like headaches, dizziness, nausea, and daytime drowsiness if taken in high doses⁶. It is advisable to consult with a healthcare provider before starting melatonin, especially for individuals on medications for seizure disorders, depression, or blood-thinning⁷.

It's important to note that the evidence supporting melatonin's effectiveness for general insomnia is relatively weak, but it can be useful for regulating sleep in cases of circadian rhythm disruptions⁸⁹.

Footnotes

1. Mayo Clinic Minute: What to consider before using melatonin supplements for sleep - Mayo Clinic News Network ↩

2. Melatonin - StatPearls - NCBI Bookshelf ↩

3. Melatonin: MedlinePlus Supplements ↩

4. Melatonin - StatPearls ↩

5. Benefits and adverse events of melatonin use in the elderly (Review) ↩

6. Mayo Clinic Minute: What are the benefits, risks of sleeping with melatonin gummies? - Mayo Clinic News Network ↩

7. Melatonin - StatPearls ↩

8. Melatonin - StatPearls - NCBI Bookshelf ↩

9. The effectiveness of melatonin for promoting healthy sleep: a rapid evidence assessment of the literature ↩