How much melatonin should you take? It depends on what you’re using it for. Melatonin supplements come in a range of amounts, but more isn’t necessarily better. Here’s how melatonin works, how dosage and timing vary by goal, when to use caution and how to choose a product.
Key terms
- Circadian rhythm: Your body’s internal clock. It follows a roughly 24-hour cycle and helps coordinate sleep and wakefulness.
- Jet lag: A temporary mismatch between your internal body clock and local time after crossing time zones.
- Immediate-release melatonin: A product designed to release melatonin soon after you take it.
- Extended-release melatonin: A product designed to release melatonin over a longer period. Release characteristics vary by product.
Key takeaways
- The right melatonin amount depends on the reason for use.
- For jet lag, the CDC says 0.5–1 mg is often enough to shift the body clock; timing depends on your trip.
- More isn’t necessarily better. Follow the product label.
- Check with a pediatrician before giving melatonin to a child.
- Melatonin may cause drowsiness and interact with some medications. Short-term use appears relatively safe for many people, though long-term safety is less clear.
What is melatonin and how does it work?
Melatonin is a hormone made mainly by the pineal gland in your brain. As it gets dark, your brain produces more melatonin, helping signal that it’s nighttime. Light exposure at night can delay or suppress this natural rise.
Think of melatonin as part of your body’s timekeeping system. It helps coordinate your circadian rhythm—the internal clock that influences when you feel ready to sleep and wake. That’s why melatonin is often described as a sleep-timing signal. It doesn’t work like a sleeping pill for everyone, but for some people, the right timing may help support their sleep schedule. A melatonin supplement may be useful for certain concerns, including jet lag or delayed sleep-wake phase disorder.1
Melatonin dosage for adults
There isn’t one amount that suits everyone or every sleep concern. Studies and products use different amounts, and the right choice depends on why you’re considering melatonin, the formulation and your individual needs.
Check the serving size and directions on the product label. If you’re comparing products, look at the amount per serving and the formulation—not just the biggest number on the bottle.
When should you take melatonin?
The best time to take melatonin depends on your goal. For jet lag or other body-clock concerns, timing can affect how your sleep schedule shifts. Taking it at the wrong time may be less helpful, so “take it right before bed” isn’t a rule for every situation.
For occasional sleep disruption, follow the product directions and consider how they fit with your bedtime. It’s also a good idea to avoid combining it with alcohol or other substances that can make you sleepy. Since melatonin may cause drowsiness, plan to take it when you can relax and don’t need to drive or stay alert.
When can melatonin help?
Melatonin for occasional sleep challenges
Having mild sleep struggles and curious about melatonin? Choose a product that fits your routine and see how you feel. Pair it with a consistent bedtime and a relaxing wind-down routine. Start with the suggested serving rather than reaching for the highest-potency option. Swanson offers a range of melatonin potencies and formulations so you can find the right one for you.
Melatonin for jet lag
Jet lag happens when your internal body clock is out of step with local time after you cross time zones. You may have trouble sleeping at night, feel sleepy during the day or find it harder to concentrate. A little travel planning can make the transition easier.
Melatonin may help some travelers adjust their sleep timing. The direction you’re traveling, the number of time zones crossed and your destination’s schedule all matter. The CDC Yellow Book offers guidance on using melatonin alongside timed light exposure and sleep scheduling. If you’re crossing several time zones, a jet lag calculator can help you map out a schedule.2
The CDC Yellow Book says that 0.5–1 mg is often enough to shift the body clock. Timing depends on your travel direction and itinerary. The CDC advises against high doses above 5 mg for this purpose.2 Swanson offers ultra-low and low dose formulations that may suit this need.
That guidance is specific to shifting your body clock during travel; it isn’t a general dose recommendation for every kind of sleep difficulty.
How to choose a melatonin supplement
If melatonin seems like a fit for your needs, a few label details can help you compare products. Check the amount per serving and the directions. Some products are immediate-release; others are designed to release melatonin over a longer period. These formulations aren’t automatically interchangeable, so follow the directions for the specific product.
Capsules, tablets, liquids and gummies can have different serving directions. Consider the formulation and ingredients alongside the amount per serving so you can choose a product that suits your needs.
Caveats and times when melatonin may not be the answer
Melatonin and chronic insomnia
An occasional restless night happens. Chronic insomnia is different: it involves ongoing difficulty falling asleep, staying asleep or waking feeling rested. Melatonin may support sleep timing for some people, but it isn’t a proven solution for chronic insomnia. NCCIH summarizes clinical guidelines that found insufficient evidence to recommend melatonin for this purpose.3 Those guidelines identify cognitive behavioral therapy for insomnia (CBT-I) as an important treatment approach.
If sleep problems keep returning or start to affect your days, help is available. A health professional can help you explore possible causes and options, including CBT-I.4
Melatonin and children
For children, talk with a pediatrician before using melatonin. The best approach depends on the child and the reason for the sleep difficulty.
Start with a consistent routine, including regular sleep and wake times, a calm wind-down period and less bright light and screen use before bed. If sleep problems continue, ask the pediatrician about next steps.5
Keep melatonin and other supplements out of children’s reach. From 2019 through 2022, the CDC estimated about 10,930 emergency department visits among children age five and younger related to unsupervised melatonin ingestion.6
Can you take too much melatonin?
More melatonin doesn’t necessarily mean better sleep. Higher amounts may increase the chance of next-day drowsiness, headache, dizziness, nausea, irritability or vivid dreams. Follow the product directions and avoid taking another dose in the middle of the night unless advised by a health professional.
Melatonin side effects and safety
Short-term melatonin use appears relatively safe for many people. Possible side effects include next-morning drowsiness, headache, dizziness and nausea.
Melatonin can interact with some medications. If you take medication, have a health condition, or are pregnant or breastfeeding, check with a pharmacist or health professional. Long-term safety is less well understood.
Everyday habits that support sleep
A supplement can be one part of a broader sleep routine. A few small habits can help set the stage for a more restful night:
- Keep your sleep and wake times fairly consistent, even on weekends.
- Dim the lights and choose calmer activities as bedtime gets closer.
- Make your bedroom dark, quiet and comfortable.
- Notice how late-day caffeine or alcohol affects your sleep.
- Get regular movement and natural light during the day.
- Find a wind-down routine that feels relaxing and realistic for you.
There’s no need to overhaul your whole routine at once. Try one or two changes and see what feels helpful. If sleep continues to be difficult or affects your everyday life, a health professional can help you explore what may be contributing and what steps could help.
Frequently asked questions
How long does melatonin take to work?
It varies by person and product. Check the label for directions. Melatonin’s timing can matter, so taking it and expecting an immediate effect may not fit every use.
What’s the difference between immediate-release and extended-release melatonin?
Immediate-release products are designed to release melatonin soon after you take them. Extended-release products release it over a longer period. Check the product label for its formulation and directions.
Swanson
About Lindsey Toth, MS, RD
Lindsey is a nationally recognized registered dietitian and nutritionist with a soft spot for ice cream. She empowers people to take charge of their health by finding the balance between the pleasure and nourishment in food. Her philosophy is that you should take care of your body because it’s the only permanent home you have. It’s what inspired her to pursue a career in nutrition.
*These statements have not been evaluated by the Food and Drug Administration. These products are not intended to diagnose, treat, cure, or prevent any disease.
Sources
- National Center for Complementary and Integrative Health. (2024, May). Melatonin: What you need to know.
- Riedy, S. M., & Williams, S. G. (2025, April 23). Jet lag disorder. In CDC Yellow Book 2026: Health information for international travel. Centers for Disease Control and Prevention.
- National Center for Complementary and Integrative Health. (2024, May). Sleep disorders and complementary health approaches.
- American College of Physicians. (2016, May 3). ACP recommends cognitive behavioral therapy as initial treatment for chronic insomnia.
- Esparham, A. (2026, January 22). Melatonin for kids: What parents should know about this sleep aid. HealthyChildren.org.
- Freeman, D. I., Lind, J. N., Weidle, N. J., Geller, A. I., Stone, N. D., & Lovegrove, M. C. (2024). Notes from the field: Emergency department visits for unsupervised pediatric melatonin ingestion—United States, 2019–2022. Morbidity and Mortality Weekly Report, 73(9), 215–217.
