What Is Melatonin?
Melatonin is a hormone your body makes in the evening to signal that it is time to sleep. Supplements are often used for jet lag, shift work, or occasional trouble falling asleep. They are not a substitute for good sleep habits but can help in the short term when used correctly. Melatonin is released by the pineal gland in response to darkness; light exposure (especially blue light from screens) can suppress it. Supplementing can help when your natural rhythm is out of sync—for example, after crossing time zones or when working night shifts. Understanding when it helps and how to use it safely maximises benefit and minimises risk.
When Melatonin May Help
Research supports melatonin for shortening the time to fall asleep and for adjusting sleep schedule after travel or shift changes. It is less clear that it improves total sleep time or deep sleep in everyone. It works best when combined with a dark, quiet environment and consistent bedtime. For jet lag, taking melatonin at the local bedtime of your destination (after arrival) can help reset your clock. For shift workers, taking it before daytime sleep may improve sleep quality. For occasional insomnia, low-dose melatonin 30–60 minutes before bed can help some people fall asleep faster. It is not a cure for chronic insomnia; if you have ongoing sleep problems, see a healthcare provider to rule out underlying causes.
Dosing and Timing
Low doses (0.5 mg to 3 mg) are often enough; more is not always better. Take it 30–60 minutes before you want to sleep. Use it for short periods (e.g. a few days to a few weeks) unless your doctor advises otherwise. Long-term use is not well studied in all groups. Some people respond to as little as 0.5 mg; others use 1–3 mg. Higher doses (5–10 mg) are sometimes sold but are rarely necessary and can increase the chance of next-day drowsiness or vivid dreams. Start low and increase only if needed. Time your dose so that you are ready for bed when melatonin peaks; taking it too early or too late can shift your rhythm in the wrong direction.
Safety and Who Should Avoid It
Melatonin is generally well tolerated. Side effects can include drowsiness the next morning or vivid dreams. Do not drive or use machinery right after taking it. It can interact with blood thinners, immunosuppressants, and some blood pressure drugs. Pregnant or nursing women and people with autoimmune or seizure disorders should talk to a doctor before use. Melatonin can affect blood sugar and blood pressure in some people; if you have diabetes or hypertension, discuss use with your doctor. Do not give melatonin to children without medical advice, as dosing and safety in paediatric populations are still being clarified.
Takeaway
Melatonin can be a useful short-term aid for falling asleep or adjusting your sleep schedule. Start low, take it close to bedtime, and pair it with healthy sleep habits: consistent sleep and wake times, a dark and cool room, and limited screens before bed. For ongoing sleep problems, see a healthcare provider to address causes and consider cognitive behavioural therapy for insomnia (CBT-I), which is often more effective long term than medication or supplements alone.
Evidence and Practical Tips
Research on supplements has grown over the past decades. Most studies focus on specific extracts, doses, and populations, so results are not always generalisable. Quality matters: choose products from reputable brands that disclose the plant or ingredient, standardisation where applicable, and dose per serving. Third-party testing (e.g. USP, NSF, ConsumerLab) when available adds assurance. Start with the lowest effective dose on the label and give any new supplement at least four to six weeks of consistent use before judging effect. Many factors influence how well a supplement works: your baseline status, diet, sleep, other medications, and lifestyle. Keeping a simple log of what you take and how you feel can help you and your provider decide whether to continue or adjust.
Supplements are not a substitute for a varied diet, adequate sleep, and regular physical activity. If you are pregnant, breastfeeding, or have a chronic condition, talk to your doctor before starting any new supplement. Children and older adults may need different doses; professional guidance ensures safety and appropriateness. Do not use supplements to replace diagnosis or treatment for medical or mental health conditions. When in doubt, a short conversation with a doctor, dietitian, or qualified herbalist can clarify whether a supplement is right for you and how to use it safely. Store supplements in a cool, dry place away from direct sunlight and keep them out of reach of children. Check the expiry date and discard any product that has changed in colour, smell, or texture.
Individual response to supplements varies. Some people notice benefits within a few weeks; others need longer or may not notice a clear effect. Genetics, diet, stress, and medication use all play a role. If you take multiple supplements, be aware of possible interactions and avoid exceeding upper limits for vitamins and minerals. Reading labels and staying within recommended doses is essential. When combining herbs or new ingredients, introduce one at a time so you can identify any adverse reactions. A balanced approach—sleep, nutrition, movement, and stress management—remains the foundation; supplements can support but not replace these habits.
In summary, informed choices about supplements support your health goals when combined with lifestyle and professional advice. Give new supplements time to show effect; consistency and patience often matter more than quick fixes. Your healthcare provider can help you tailor intake to your individual needs and avoid interactions with medications or other supplements.
