Homeopathic Melatonin

With melatonin, the honest answer starts with Australian law rather than the evidence. Here's how our naturopaths work out whether you should talk to a pharmacist, see a doctor, or try something we can offer you today.

A good fit if

• You're 55 or over, your sleep quality is poor, and you'd like to ask a pharmacist whether short-term modified-release melatonin suits you
• You have a long flight coming up and want to talk through the jet lag option with a pharmacist before you go
• You want to understand the Australian rules properly before you buy anything, here or from an overseas site
• You'd rather work on sleep timing, evening light and a wind-down routine, with a non-prescription product alongside
• You want a plan a practitioner has looked over, rather than a product handed to you at a counter

Check with us first if

• You take any prescription medicine. Melatonin has known interactions, and the pharmacist supplying it needs to see your full list.
• You already use sedating herbal products such as valerian, hops or passionflower. Healthdirect advises against taking other sleep-promoting herbal remedies at the same time as melatonin, because together they can make you very drowsy.
• You do shift work, or your body clock has drifted a long way. Timing is everything here, and a dose at the wrong time can push your clock further in the wrong direction.
• You've already bought melatonin from an overseas website. Bring it in and we'll help you work out what to do with it, because TGA lab testing found big differences in the actual doses in those products.
• You're thinking about melatonin for a child or teenager. That's a conversation for a doctor, not a shop, and in Australia it needs a prescription.
• You have an ongoing sleep problem that's never been checked. Persistent insomnia deserves a proper diagnosis before a product.

• Modified-release tablets, 2 mg or less. Best known for: The only melatonin an Australian pharmacist can supply for sleep without a prescription. Absorption: Released slowly over several hours, designed to mimic the body's own overnight rise and fall. Typical use: Short-term use in adults aged 55 or over, in packs of no more than 30 tablets.
• Immediate-release preparations, 5 mg or less, for jet lag. Best known for: The second pharmacist-only exception, added for travel rather than for insomnia. Absorption: Rises and clears quickly, giving one sharp timing signal rather than overnight cover. Typical use: Adults 18 and over, in a primary pack of no more than 10 doses.
• All other melatonin: higher strengths, liquids, gummies, children's doses. Best known for: Everything outside the two exceptions, which is most of the melatonin sold worldwide. Absorption: Varies widely by product, and isn't assessed unless the product is registered here. Typical use: Prescription only in Australia, at a doctor's decision.
• Homeopathic melatonin (labelled 5X, 6X or 30C). Best known for: Sold in Australian health food stores; these are homeopathic dilutions, not melatonin doses. Absorption: Not comparable. At 30C no melatonin can be measured, so absorption isn't the relevant question. Typical use: Judge these as homeopathy, on their own evidence, not as a substitute for melatonin.
• Products ordered from overseas websites. Best known for: The trap people fall into when they see melatonin on a supermarket shelf overseas. Absorption: Unverified. TGA lab testing found big differences between what the label said and what was in the product. Typical use: Not assessed by the TGA for quality or safety, and the subject of a September 2025 safety alert.
• Food and food-derived products such as tart cherry. Best known for: Melatonin that occurs naturally, in nanograms rather than milligrams. Absorption: Eaten as food, along with the polyphenols that come with it. Typical use: Freely available here, and the basis of the tart cherry products sold for sleep support.

Reference values. None. Melatonin is a hormone, not an essential nutrient, so the NHMRC sets no recommended intake for it. You can't be deficient in it by dietary standards.

Typical supplemental range. There's no Australian supplement range, because melatonin can't legally be sold here as a supplement. The two strengths a pharmacist may supply are capped by the Poisons Standard at 2 mg per modified-release dose and 5 mg per immediate-release dose for jet lag. Any other strength or form needs a prescription, and then the dose is up to your prescriber.

Upper level. There's no NHMRC upper limit. The 2 mg and 5 mg figures are legal supply limits in the Poisons Standard, not safety ceilings, so don't read them as either.

Worth knowing. For background only, not as guidance: a 2024 meta-analysis of 26 randomised trials, pooling 1,689 observations, found melatonin gradually shortened the time it took to fall asleep and increased total sleep time, peaking at 4 mg a day. Taking it about three hours before the bedtime you want improved the effect. That 4 mg is more than an Australian pharmacist may supply, which is exactly why it's background and not a dose. What you need depends on your age, diet and health, so talk to one of our naturopaths.

Food first, where the diet allows it.

• Tart (sour) cherries: 13.46 ng per gram fresh weight (roughly 1.3 micrograms in 100 g of fruit)
• Wheat: 124.7 ng per gram fresh weight
• Oats: 90.6 ng per gram fresh weight
• Tomato: 14.77 ng per gram fresh weight
• Pistachios: reported as high as 233,000 ng per gram dry weight (an outlier figure, and published values for nuts vary enormously)
• Cow's milk: no single figure; content follows the animal's own day-night rhythm, and night-milked milk has been reported at around ten times daytime levels

If any of these sound like you, talk to one of our naturopaths or your doctor before you start.

• Pregnancy. Healthdirect advises against melatonin; its effect on the baby isn't known.
• Breastfeeding. Safety isn't established, so get medical advice.
• Children under 2. Healthdirect says melatonin shouldn't be given.
• Children and teenagers in general. It's prescription only in Australia, so it's a medical decision, not a shopping one.
• Driving or operating machinery. Healthdirect advises against taking melatonin beforehand because it makes you sleepy.
• Other sedating herbal sleep products (valerian, hops, passionflower). Healthdirect advises against combining them, as this can cause marked drowsiness.
• Any prescription medicine. There are recognised interactions, so the pharmacist or prescriber supplying it needs to see your full list.
• Known side effects. Daytime sleepiness, headache, nausea, dizziness and, rarely, mood swings.
• Products bought from overseas websites. They aren't assessed by the TGA, and TGA testing found some with up to 400% more melatonin than labelled and some with none.
• Insomnia that's undiagnosed or won't go away. It needs proper assessment rather than an unsupervised trial.
• Homeopathic melatonin products. These are dilutions, not melatonin doses, and shouldn't be judged as if they were.
• If you take prescription medicines, check with your doctor, pharmacist or one of our naturopaths before you start.