Melatonin Dosage for Adults: How Many Milligrams Should You Take?
Melatonin is a hormone that helps regulate the body’s sleep-wake cycle. Over-the-counter melatonin supplements are commonly used for occasional sleep difficulties, jet lag, or schedule changes. The right amount depends on why you’re taking it, the product, and your health. More is not necessarily better.
Common melatonin amounts for adults
Many adults who choose to try melatonin start with a low dose, such as 0.5 to 1 milligram (mg). Some products and studies use doses of 1 to 3 mg. Higher-dose products are available, but they may increase the chance of side effects and are not automatically more effective.
There is no single dose that works for everyone, and recommendations can differ depending on the sleep issue. For example, melatonin timing may matter more than dose when adjusting to jet lag or a shifted sleep schedule. Ask a health professional for guidance if you’re considering regular use or a higher dose.
When to take melatonin
For occasional trouble falling asleep, melatonin is generally taken before bedtime, following the product label or a clinician’s advice. The best timing can vary by product and purpose. Taking it at the wrong time may not help and can affect your sleep schedule, so ask a pharmacist or clinician if you’re unsure.
Some products are immediate-release, while others are extended- or prolonged-release. They are not interchangeable in every situation. Follow the directions for the specific product, and don’t take extra doses because the first one doesn’t seem to work.
Possible side effects and precautions
Melatonin may cause sleepiness, dizziness, headache, or nausea. It can also leave some people feeling groggy the next day. Avoid driving or operating machinery if you feel drowsy, and avoid combining melatonin with alcohol or other substances that cause sleepiness unless a clinician says it is safe.
Check with a health professional before using melatonin if you take prescription or over-the-counter medicines, have a chronic health condition, or are pregnant or breastfeeding. Melatonin can interact with some medicines, including certain blood thinners, seizure medicines, and medicines that affect blood pressure or the immune system. This is not a complete list.
Choosing a supplement
In the United States, melatonin is sold as a dietary supplement and is not approved by the FDA as a treatment for insomnia. Supplement contents may vary from the amounts listed on the label. When possible, choose products tested by an independent organization, such as USP or NSF, and follow the package directions.
When to seek help for sleep problems
Melatonin is not a substitute for evaluating ongoing sleep problems. If difficulty sleeping lasts for weeks, regularly affects your daytime functioning, or comes with symptoms such as loud snoring or gasping during sleep, talk with a health professional. For chronic insomnia, cognitive behavioral therapy for insomnia (CBT-I) is a well-established treatment.
Bottom line: Adults often begin with 0.5 to 1 mg, but the appropriate amount and timing depend on the reason for use and individual circumstances. Use the lowest amount that may help, follow the product directions, and consult a clinician or pharmacist when in doubt.
Melatonin Dosage for Adults: 9 Tips for Safer Use
- Start with a low dose, such as 0.5–1 mg.
- Take it about 30–60 minutes before bedtime.
- More isn’t always better; higher doses may increase side effects.
- Use the lowest dose that helps, for the shortest time needed.
- Check the label
- Ask a clinician or pharmacist about interactions with your medicines.
- Avoid alcohol and don’t drive if you feel drowsy.
- Talk with a clinician before use if you have a health condition.
- Seek medical advice if sleep problems persist or worsen.
Start with a low dose, such as 0.5–1 mg.
Adults considering melatonin can start with a low dose, such as 0.5–1 mg, rather than assuming that more will work better. Follow the product directions and take it at the recommended time, since timing can affect how well it works. Melatonin may cause side effects such as drowsiness, dizziness, or headache, so check with a health professional or pharmacist before using it regularly or if you take other medications.
Take it about 30–60 minutes before bedtime.
Take melatonin about 30–60 minutes before bedtime, following the directions on the product label or your health professional’s advice. The timing can vary depending on the product and why you’re taking it, so avoid taking extra if you don’t feel sleepy right away.
More isn’t always better; higher doses may increase side effects.
When it comes to melatonin, more isn’t always better. Higher doses may not improve sleep and can increase the risk of side effects, such as next-day grogginess, dizziness, or headache. Adults considering melatonin should follow the product directions and ask a health professional or pharmacist for guidance, especially before increasing the dose or using it regularly.
Use the lowest dose that helps, for the shortest time needed.
For adults who choose to use melatonin, start with the lowest dose that seems helpful and use it only for as long as needed. Taking more doesn’t necessarily improve sleep and may increase the chance of side effects, such as morning grogginess, dizziness, or headache. Follow the product directions, and talk with a health professional if sleep problems persist or you need melatonin regularly.
Check the label
Check the label before taking melatonin: products can come in different strengths and forms, including immediate- and extended-release tablets. Follow the package directions, note how many milligrams are in each serving, and don’t take extra doses if you’re unsure how much you’ve taken. If the instructions are unclear or you take other medications, ask a pharmacist or healthcare professional for guidance.
Ask a clinician or pharmacist about interactions with your medicines.
Before taking melatonin, ask a clinician or pharmacist whether it could interact with your medicines or supplements. Melatonin may affect how some medications work, and medicines that cause drowsiness may increase its sedating effects. Share a complete list of what you take, including over-the-counter products, so they can help you decide whether melatonin is appropriate and how to use it safely.
Avoid alcohol and don’t drive if you feel drowsy.
Avoid drinking alcohol while taking melatonin, since combining them may increase drowsiness and impair coordination or judgment. Melatonin can also make you feel sleepy or less alert the next day. Don’t drive, ride a bike in traffic, or operate machinery if you feel drowsy; wait until you’re fully alert.
Talk with a clinician before use if you have a health condition.
If you have a health condition, talk with a clinician before taking melatonin. It may affect certain conditions or interact with prescription and over-the-counter medicines, including drugs that influence blood pressure, blood clotting, seizures, or the immune system. A clinician or pharmacist can help you assess whether melatonin is appropriate and discuss safe timing and dosage for your situation.
Seek medical advice if sleep problems persist or worsen.
If your sleep problems persist or get worse, consult a healthcare professional rather than increasing your melatonin dose or relying on supplements long term. Ongoing sleep difficulties can have underlying causes that need attention, and a clinician can review your symptoms, medications, and health history to recommend an appropriate approach.
