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Magnesium in Australia: evidence and prices
TL;DR
Magnesium is an essential mineral found in leafy greens, legumes, nuts, seeds and wholegrains. Upper limits for adults apply to magnesium from supplements (350 mg/day, Australian/NZ NRV), not from food. Too much supplemental magnesium can cause diarrhoea. People with kidney disease and people on certain medicines should check with a GP or pharmacist.
What official sources say
healthdirect lists green leafy vegetables, legumes, nuts and seeds, and wholegrains as food sources. The Australian/NZ Nutrient Reference Values (NHMRC) set an adult upper limit of 350 mg/day for magnesium from supplements, not food. NIH ODS notes that magnesium can interact with some medicines. [1] [2] [3]
Forms
Supplements come in many forms (glycinate, citrate, oxide and others). NIH ODS discusses differences in absorption between forms, but labels list elemental magnesium differently, so compare the "elemental magnesium" amount on the label. [3]
Prices in Australia
Listed prices on iHerb Australia search results (AUD, before shipping and promo codes), checked 15 Oct 2026, ~9:25–9:35 PM AEST. Prices change often. This is not an endorsement, and no affiliate links are used.
| Product (as listed) | Price | Source |
|---|---|---|
| Now Foods Magnesium Glycinate 180 Tablets 100 Mg Per Tablet | A$37.54 | iHerb AU |
| Doctor'S Best High Absorption Magnesium Lysinate Glycinate Chelated Albion Traacs 240 Tablets 100 Mg Per Tablet | A$43.69 | iHerb AU |
| Doctor'S Best High Absorption Magnesium Lysinate Glycinate Chelated Albion Traacs 120 Tablets 100 Mg Per Tablet | A$23.31 | iHerb AU |
Chemist Warehouse and Priceline: price check pending.
FAQ
How much magnesium is too much?
The Australian/NZ NRVs give an adult upper limit of 350 mg/day for magnesium from supplements. Food magnesium is not counted in that limit.
Should I take magnesium for sleep?
We can't advise on individual use. Talk to your GP or pharmacist about sleep concerns.
Sources
- healthdirect: Magnesium
- NHMRC Nutrient Reference Values for Australia and New Zealand: Magnesium (Eat For Health)
- NIH ODS: Magnesium fact sheet
Sources checked 15 Oct 2026. Pending human review before publication.