Extended-Release Melatonin vs Immediate-Release Melatonin
How extended-release melatonin and immediate-release melatonin differ in potency, absorption, tolerance, and cost.
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Side by Side
| Extended-Release Melatonin | Immediate-Release Melatonin | |
|---|---|---|
| Absorption | Variable | Variable |
| How it is absorbed | Formulated to release over several hours, keeping blood levels elevated through the night to mimic the endogenous profile. | Rapidly absorbed with oral bioavailability of roughly 9-33% due to first-pass hepatic metabolism by CYP1A2. Peaks within about an hour; half-life under an hour. |
| Typical dose | 2 mg (licensed prolonged-release dose in the EU for adults 55 and older) | 0.5-5 mg; 0.5 mg is enough for circadian phase shifting |
| Common uses | sleep maintenance, older adults with low endogenous melatonin | jet lag, delayed sleep phase, sleep onset |
| Side effects | Morning grogginess if taken late. | Next-day grogginess at higher doses, headache, vivid dreams. |
| Cost | Low | Low |
| Also called | prolonged-release melatonin, time-release melatonin, Circadin | fast-release melatonin |
When to Choose Extended-Release Melatonin
Choose extended-release melatonin when the problem is staying asleep rather than falling asleep. Prescription-grade prolonged-release melatonin is licensed in the EU for primary insomnia in adults 55 and older.
Extended-Release Melatonin
Better matched to waking in the night, and mainly studied in adults over 55.
What to look for: 1-2 mg prolonged-release tablets. Gummies and liquids cannot be extended release.
Find on iHerb Affiliate linkWhen to Choose Immediate-Release Melatonin
Choose immediate-release melatonin when the problem is falling asleep or shifting your body clock. For circadian shifting, timing matters more than dose. Actual content often differs from the label.
Immediate-Release Melatonin
For shifting the clock and for falling asleep. Small doses do the work.
What to look for: 0.3-1 mg tablets, USP Verified where available. Split larger tablets if that is all you can find.
Find on iHerb Affiliate linkProducts on Titrate
2,685 of the 214,745 labels in the NIH Dietary Supplement Label Database list melatonin as an active ingredient (1,519 on market). 1,700 are sold as melatonin products by name.
Melatonin does not have its own search category yet. Each product above links to its full label in the NIH database.
Related
References
NIH National Center for Complementary and Integrative Health. Melatonin: What You Need To Know.
Zhdanova IV, et al. Melatonin treatment for age-related insomnia. J Clin Endocrinol Metab. 2001;86(10):4727-4730.
Herxheimer A, Petrie KJ. Melatonin for the prevention and treatment of jet lag. Cochrane Database Syst Rev. 2002;(2):CD001520.
Burgess HJ, et al. Human phase response curves to three days of daily melatonin: 0.5 mg versus 3.0 mg. J Clin Endocrinol Metab. 2010;95(7):3325-3331.
Ferracioli-Oda E, Qawasmi A, Bloch MH. Meta-analysis: melatonin for the treatment of primary sleep disorders. PLoS One. 2013;8(5):e63773.
Erland LAE, Saxena PK. Melatonin natural health products and supplements: presence of serotonin and significant variability of melatonin content. J Clin Sleep Med. 2017;13(2):275-281.
Sateia MJ, et al. Clinical Practice Guideline for the Pharmacologic Treatment of Chronic Insomnia in Adults: An American Academy of Sleep Medicine Clinical Practice Guideline. J Clin Sleep Med. 2017;13(2):307-349.
Lelak K, et al. Pediatric Melatonin Ingestions: United States, 2012-2021. MMWR Morb Mortal Wkly Rep. 2022;71(22):725-729.
Cohen PA, et al. Quantity of Melatonin and CBD in Melatonin Gummies Sold in the US. JAMA. 2023;329(16):1401-1402.