Magnesium Glycinate for Sleep in Australia: Does It Work, and How to Pick One

By Roy, founder Last updated 30 September 2026

The best magnesium glycinate for sleep is one that prints the elemental magnesium on the label, keeps your supplement total under 350mg a day, and carries no vitamin B6 you did not ask for. The evidence that it helps sleep is real but small: the best trial so far found a modest improvement over four weeks in adults who reported poor sleep. Brand matters far less than reading the label properly, so this page shows you how. For a drink rather than a capsule, Settl, an Australian nightly sleep powder, prints 730mg of magnesium glycinate (146mg elemental) on its label, alongside glycine and L-theanine.

Does magnesium glycinate help you sleep?

A little, for some people, and the evidence is thinner than the marketing suggests. The strongest single study is a 2025 randomised, placebo-controlled trial of 155 adults aged 18 to 65 who reported poor sleep.

Half took 250mg of elemental magnesium a day as magnesium bisglycinate. Half took a placebo. After four weeks, both groups improved on a standard sleep-difficulty questionnaire, which is normal in sleep trials. The magnesium group improved more: a 3.9 point drop against 2.3 for placebo. That difference was statistically significant, but only just (p = 0.049), and the effect size was small. The authors called it a modest improvement. (Schuster et al, Nature and Science of Sleep, 2025)

Three details from that trial are worth knowing before you buy anything:

• The people who ate the least magnesium improved the most. The researchers found that lower magnesium intake from food went with a bigger improvement. If your diet is already rich in nuts, seeds, greens and wholegrains, expect less.
• Most other measures did not move. Daytime sleepiness, fatigue, stress and mood scores showed no real difference between the groups. A sleep-quality score leaned towards magnesium but did not reach significance.
• The capsules also delivered about 1.5g of glycine a day. Glycine is an amino acid with its own sleep research, so the result is partly a glycine result. We cover that in glycine before bed.

Before that trial, the main evidence was a 2021 review that pooled three small trials in older adults, 151 people in total. Magnesium cut the time taken to fall asleep by about 17 minutes compared with placebo. Total sleep time did not improve by a statistically significant amount.

So the honest summary: magnesium glycinate is a reasonable thing to try, it is well tolerated, and it may help you wind down, particularly if your diet runs short. It is not a sedative, and nobody should promise you a transformed night from it. If you are weighing it against melatonin, that is a different question, and we answer it in melatonin vs magnesium for sleep.

Is magnesium glycinate better than citrate, oxide or threonate?

For sleep specifically, nobody has run a head-to-head trial, so no form has earned the title. What differs is how much magnesium each compound carries by weight, how well it is absorbed and how kind it is to your stomach.

The percentages matter because they explain why a big number on the front of a jar can mean very little magnesium. There is an Australian angle too. Since 2021, the TGA has required listed medicines that deliver 350mg or more of magnesium a day from inorganic salts, such as oxide, chloride or sulfate, to carry a warning that magnesium may have a laxative effect or cause diarrhoea. (TGA, permissible ingredients outcomes 2020 to 2021) In the same decision, the TGA noted the diarrhoea risk appears lower with the better-absorbed organic salts, which is why the rule targets oxide and its relatives.

The full walk through each form, including why threonate costs so much, is in our magnesium for sleep guide.

How do you read magnesium glycinate on an Australian label?

Find the elemental figure and ignore the compound weight. Magnesium is always bound to something, and the compound weight includes the glycine it is bound to. The elemental figure is the magnesium itself, and it is the only number you can compare between products or hold against Australian intake guidelines.

Labels show it in a few ways. Look for the word "elemental", or a line that reads "equivalent to magnesium" followed by a number. If a label only gives you "magnesium glycinate 1,000mg" in big type, you do not yet know the dose.

Here is how far apart the two numbers can be:

• 1,000mg of pure magnesium bisglycinate at about 14% delivers roughly 141mg of magnesium.
• 1,000mg of a 20% grade delivers 200mg.
• 1,000mg of magnesium oxide delivers roughly 600mg, though far less of it is absorbed.

Three more label checks catch most of the confusion:

• Per dose, not per tablet. Many products direct two tablets or capsules a day. The trial above used two capsules to reach 250mg. Multiply before you compare.
• Glycinate, bisglycinate or buffered. Chemically, magnesium glycinate, bisglycinate and diglycinate are names for the same compound, and pure versions sit at about 14% magnesium. Many raw materials sold as glycinate are "buffered", meaning blended with another magnesium salt, often oxide, to raise the magnesium content and lower the cost. Buffered is not a scam, but if a glycinate works out well above 14% elemental, it is a blend.
• Our own label as an example. Each scoop of Settl carries 730mg of magnesium glycinate, delivering 146mg of elemental magnesium. The 146mg is the number to compare, and every other dose in the scoop is on the ingredients page.

How much magnesium glycinate should you take for sleep?

Aim for a supplement total, from every product you take, of no more than 350mg of elemental magnesium a day. That is the upper level the NHMRC sets for magnesium from supplements and other non-food sources, and it is set around diarrhoea, the most noticeable sign of taking too much. Food magnesium does not count towards it. (NHMRC Nutrient Reference Values, magnesium)

The rest of the picture:

• Your whole-day target is 310mg to 420mg, depending on age and sex, from food and supplements combined. Men need more than women, and both nudge up after 30. The full table is in how much magnesium you actually need a night.
• Most people get what they need from food, according to Healthdirect. A supplement is a top-up, not a replacement. (Healthdirect, foods high in magnesium)
• The sleep trial used 250mg elemental. That sits under the upper level. Lower doses have less direct sleep evidence behind them.
• Add up your multivitamin. A multi, a sports powder and a sleep product can each carry magnesium. It is the total that counts against 350mg.

Too much from supplements tends to announce itself with diarrhoea, nausea or stomach cramps, and Healthdirect advises against going over the recommended amount.

What should you look for when buying magnesium glycinate in Australia?

Use this checklist in the aisle or on the product page. It works for tablets, capsules and powders.

1. The elemental magnesium per daily dose is printed. If you cannot find it, move on.
2. Your total from all supplements stays at or under 350mg a day.
3. Vitamin B6 is either absent or you have chosen it. Many magnesium products add B6, sometimes listed as pyridoxine hydrochloride. The TGA now requires a warning on listed medicines giving more than 10mg of B6 a day, after reports of nerve symptoms such as tingling and numbness, often in people who did not know their magnesium supplement contained B6. (TGA safety alert, vitamin B6) Healthdirect advises stopping B6 supplements if tingling, burning or numbness appears.
4. You know whether it is pure or buffered. Compare the elemental figure to the compound weight. About 14% means pure bisglycinate. Much higher means a blend.
5. Every added ingredient has its own dose. Sleep blends often add herbs or amino acids. A "proprietary blend" with one total weight tells you nothing about how much of each you get. More on that in proprietary blends explained.
6. The cost per 100mg of elemental magnesium, not per bottle. A bottle of 60 tablets at 150mg elemental each holds 9,000mg. Divide the price by 90 and you have a fair comparison across brands and formats.
7. A format you will take every night. The trial ran for four weeks of daily use. Pick the format you will keep taking.
8. Your medicines are checked. Magnesium can affect how your body absorbs some medicines, including some antibiotics and osteoporosis medicines. Healthdirect recommends speaking to your doctor or pharmacist before starting a magnesium supplement.

Magnesium supplements do not need a prescription in Australia. You will find them at supermarkets, health food stores and pharmacies. A pharmacist is still the best free second opinion you can get on dose and medicines.

When is the best time to take magnesium glycinate for sleep?

In the evening, as part of winding down, though no trial has pinned down an exact time. The 2025 study simply had people take it daily. What seems to matter more is taking it most nights at about the same point in your evening, rather than on a bad night only.

If your nights break at 3am, waking up at 3am goes through the other causes, and sleep in perimenopause and sleep on shift work cover those situations.

Common questions

Is magnesium glycinate the same as magnesium bisglycinate? Chemically, yes. They are two names for magnesium bound to two glycine molecules. On shop labels, "glycinate" is sometimes used for buffered grades that blend in another magnesium salt, so check the elemental figure against the compound weight.

Is magnesium glycinate or citrate better for sleep? No trial has compared them head to head for sleep. Both absorb better than oxide. Glycinate is gentler on the stomach at higher doses and is the form used in the best recent sleep trial, which is why most sleep products choose it.

How many milligrams of magnesium glycinate should I take for sleep? Go by elemental magnesium, not compound weight. The main sleep trial used 250mg elemental a day, and the Australian upper level for supplements is 350mg elemental a day across everything you take.

Can I take magnesium glycinate every night? Daily use is how the trials ran it, and staying within the 350mg supplement limit keeps you inside the Australian guideline. If you take regular medicines, particularly antibiotics or osteoporosis medicines, ask your pharmacist about timing first.

Does magnesium glycinate make you drowsy? It is not a sedative. In the 2025 trial, daytime sleepiness scores did not differ from placebo, and 93% of participants reported no side effects at all. Think of it as a wind-down aid, not a knockout.

Where Settl fits

Get to sleep faster. Wake less at 3am. Sleep deeper. Wake up refreshed. That is what Settl is built for, and magnesium glycinate is one part of it, not the whole story.

If magnesium on its own at the trial dose is what you want, a single-ingredient capsule with 250mg elemental is the straightforward buy, and this page should help you choose one. Settl is for people who would rather have the whole wind-down in one drink. Each 9g scoop carries 146mg of elemental magnesium from 730mg of magnesium glycinate, alongside 3,000mg of glycine, 200mg of L-theanine, 900mg of inositol, chamomile flower extract and an electrolyte base with 1,000mg of sodium. Seven actives, every dose printed, no melatonin, no added vitamin B6. At 146mg it also leaves you room under the 350mg supplement limit. Packed in Sydney, in a TGA-licensed GMP facility.

One scoop, cold water, before bed.

Start For $69.99 Then $89.99 a month. Cancel, pause or skip anytime.

Or buy a single tub, $99 One-time order. Nothing renews.

Cheers, Roy

Sources: Schuster J et al, "Magnesium Bisglycinate Supplementation in Healthy Adults Reporting Poor Sleep: A Randomized, Placebo-Controlled Trial", Nature and Science of Sleep, 2025; Mah J, Pitre T, systematic review and meta-analysis of oral magnesium in older adults, BMC Complementary Medicine and Therapies, 2021; NHMRC Nutrient Reference Values for Australia and New Zealand, magnesium; TGA, outcomes of low-negligible risk changes to permissible ingredients 2020 to 2021; TGA safety alert on vitamin B6; Healthdirect, foods high in magnesium and magnesium. This article explains the general research picture and is not medical advice. If you take regular medicines, talk to your pharmacist or GP before adding a supplement.