Melatonin Dosage: How Much to Take and When
Melatonin is the hormone your body produces when darkness falls, signalling that it is time to sleep. Supplemental melatonin is one of the most studied sleep aids, yet dosing mistakes are extremely common. Most over-the-counter tablets contain 3--10 mg, which is 10--30 times the amount your body makes naturally (Zhdanova et al., 2001). This guide covers what the research actually shows about effective doses.
Who This Guide Is For
Anyone who uses or is considering melatonin for jet lag, shift work, delayed sleep phase, or general insomnia. After reading you will know the right dose for your situation, the best time to take it, and which formulations to prefer.
TL;DR
- Start at 0.3--0.5 mg, not the 3--10 mg found in most products
- Take it 30--60 minutes before your target bedtime
- Melatonin works best for jet lag and delayed sleep phase, less for chronic insomnia
- Extended-release may help if you wake up in the middle of the night
- Higher doses are not more effective and can cause grogginess
- It is not habit-forming but should not be used indefinitely without reason
How Melatonin Works
Your pineal gland secretes roughly 0.1--0.3 mg of melatonin per night in a healthy adult (Vakkuri et al., 1984). This tiny amount is enough to shift your circadian rhythm. Supplemental melatonin works the same way: it binds to MT1 and MT2 receptors in the suprachiasmatic nucleus, telling the brain that night has arrived.
The key insight is that melatonin is a timing signal, not a sedative. Taking more does not make you sleepier -- it can actually fragment sleep in the second half of the night because blood levels remain elevated past the natural decline point (Zhdanova et al., 2001).
Recommended Doses by Situation
General sleep improvement
0.3--1 mg, 30--60 minutes before bed. A landmark MIT study found that 0.3 mg restored sleep efficiency in older adults to youthful levels, while 3 mg produced excessive daytime melatonin and did not improve sleep further (Zhdanova et al., 2001).
Jet lag
0.5--3 mg on the day of arrival and for 2--4 nights after. Take it at local bedtime. A Cochrane review of 10 trials confirmed that melatonin in this range significantly reduces jet lag severity, especially when crossing 5 or more time zones (Herxheimer & Petrie, 2002).
Delayed sleep phase syndrome (DSPS)
0.3--0.5 mg, taken 4--6 hours before current sleep onset (not before desired bedtime). This advances your clock gradually. Higher doses taken close to bedtime may not shift the rhythm enough.
Shift work
1--3 mg before daytime sleep. Combined with blackout curtains and blue-light-blocking glasses, this protocol measurably shortens sleep latency for night-shift workers (Liira et al., 2014).
Children (under medical supervision only)
0.5--1 mg. Paediatric use should always be guided by a physician. Studies in children with ADHD or autism spectrum disorder show benefit at these low doses (Bruni et al., 2015).
Timing Matters More Than Dose
| Goal | When to take | Dose |
|---|---|---|
| Fall asleep faster | 30--60 min before bed | 0.3--1 mg |
| Shift rhythm earlier | 4--6 hours before current sleep | 0.3--0.5 mg |
| Jet lag (eastbound) | Local bedtime on arrival | 0.5--3 mg |
| Jet lag (westbound) | Local bedtime, second half of trip | 0.5--1 mg |
| Stay asleep longer | At bedtime, extended-release | 0.5--2 mg |
Immediate-Release vs Extended-Release
Immediate-release (IR) melatonin peaks in blood within 30--60 minutes and clears within 4--5 hours. This mimics the natural rise but not the full night plateau. Extended-release (ER) formulations maintain levels for 6--8 hours.
Choose IR if your main problem is falling asleep. Choose ER if you fall asleep fine but wake at 2--3 AM. Some people combine a small IR dose (0.3 mg) with an ER dose (0.5--1 mg) for full-night coverage.
Common Mistakes
1. Starting at 5--10 mg -- These mega-doses flood receptors and cause next-day grogginess. Start low.
2. Taking it too late -- If you take melatonin at midnight when you want to sleep at 11 PM, the timing signal arrives after the window.
3. Using it as a sedative -- Melatonin is not a sleeping pill. It adjusts your clock, it does not knock you out.
4. Ignoring light exposure -- Bright screens after taking melatonin suppress your own production and fight the supplement.
5. Long-term use without re-evaluation -- Melatonin is safe short-term, but chronic use should be reviewed with a healthcare provider.
Side Effects
At physiological doses (under 1 mg), side effects are rare. At higher doses the most common complaints are:
- Morning grogginess / "melatonin hangover"
- Vivid dreams or nightmares
- Mild headache
- Nausea (usually dose-dependent)
- Dizziness
Melatonin does not suppress your body's own production, so there is no withdrawal or dependency risk (Buscemi et al., 2006). However, it can interact with blood thinners, diabetes medications, and immunosuppressants.
What to Look for in a Product
- Low dose: 0.3--1 mg per serving (avoid 5--10 mg unless you plan to split tablets)
- Third-party tested: NSF or Informed Sport certification
- Minimal fillers: Especially avoid products with added B6 above 10 mg (can cause neuropathy at chronic high doses)
- Form: Sublingual tablets or liquid drops allow precise micro-dosing
Browse sleep supplements at MaxFit.ee for options available with fast delivery in Estonia.
FAQ
Is 10 mg of melatonin too much?
For most adults, yes. Research shows 0.3--1 mg is effective. 10 mg is 30--100x the physiological dose and frequently causes next-day drowsiness without improving sleep quality.
Can I take melatonin every night?
Short-term nightly use (up to 3 months) appears safe in studies. For longer use, discuss with your doctor and consider whether underlying sleep hygiene issues should be addressed first.
Does melatonin work for anxiety?
Melatonin is not an anxiolytic, but pre-surgical studies show 0.3--0.5 mg reduces anticipatory anxiety (Madsen et al., 2020). It should not replace proper anxiety treatment.
Is melatonin safe during pregnancy?
Insufficient evidence exists to recommend melatonin during pregnancy. Consult your physician.
Can I combine melatonin with magnesium?
Yes. Magnesium glycinate complements melatonin well -- magnesium supports GABA activity while melatonin handles the circadian signal. A typical pairing is 200--400 mg magnesium glycinate + 0.3--0.5 mg melatonin.
References
1. Zhdanova, I.V., Wurtman, R.J., Regan, M.M., Taylor, J.A., Shi, J.P. & Leclair, O.U. (2001). Melatonin treatment for age-related insomnia. Journal of Clinical Endocrinology & Metabolism, 86(10), 4727--4730.
2. Herxheimer, A. & Petrie, K.J. (2002). Melatonin for the prevention and treatment of jet lag. Cochrane Database of Systematic Reviews, (2), CD001520.
3. Vakkuri, O., Leppaluoto, J. & Kauppila, A. (1984). Oral administration and distribution of melatonin in human serum, saliva and urine. Life Sciences, 37(5), 489--495.
4. Liira, J., Verbeek, J.H., Costa, G., Driscoll, T.R., Sallinen, M., Isotalo, L.K. & Ruotsalainen, J.H. (2014). Pharmacological interventions for sleepiness and sleep disturbances caused by shift work. Cochrane Database of Systematic Reviews, (8), CD009776.
5. Bruni, O., Alonso-Alconada, D., Besag, F., Biran, V., Braam, W.,"; Cortese, S. et al. (2015). Current role of melatonin in pediatric neurology. European Journal of Paediatric Neurology, 19(2), 122--133.
6. Buscemi, N., Vandermeer, B., Hooton, N., Pandya, R., Tjosvold, L., Hartling, L., Vohra, S., Klassen, T.P. & Baker, G. (2006). Efficacy and safety of exogenous melatonin for secondary sleep disorders. British Medical Journal, 332(7538), 385--393.
7. Madsen, B.K., Zetner, D., Moller, A.M. & Rosenberg, J. (2020). Melatonin for preoperative and postoperative anxiety in adults. Cochrane Database of Systematic Reviews, (12), CD009861.
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