Products / Magnesium / By retailer
10 products with an RRP or regular price seen at Chemist Warehouse, lowest cost per 100 mg of magnesium first. Prices are as seen on the dates shown, most recently 27 Oct 2026. Check the shop before you rely on one.
5 of 10 could be checked against their own figures: 2 fully, 3 mostly (why the others can’t be). None links a test document yet (what that means).
Sorted by cost per 100 mg at Chemist Warehouse, lowest first, until you sort. 10 products so far, added a few at a time, so not the whole market. No brand or retailer pays for inclusion, placement or marks.
Prices are the recommended retail price (RRP), or the regular shelf price where no RRP is shown. Sale and member prices aren’t used, so you may pay less.
“Label says” and “Our maths” are the magnesium you actually get per serve, not the compound weight. Labels call it elemental magnesium. “Cost per 100 mg” is what that magnesium costs, so small and large doses compare fairly.
| Line | Product | Form | Label says | Our maths | Adds up? | Testing | Cost per 100 mg of magnesium | Cost per serve | Price used | Compare |
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Cenovis Mega Magnesium (325 mg elemental per tablet)Mixed compoundsLowest cost per 100 mg of 7 blends; figures can’t be double-checked; no AUST L number on record yet; 1 tablet a serve | mixed compounds | 325mgper brand page: the brand’s product page | Can’t checkonly the magnesium figure givenwhy? | can’t check: no compound weight | no testing claim found | $0.036 | 12c a tablet | Regular price $34.99 · 300 tabletsChemist Warehouse · 27 Oct 2026 | |
| 2 | Bioglan Active Magnesium 1000Mixed compounds2nd lowest cost per 100 mg of 7 blends; mostly adds up (85 %); no AUST L number on record yet; 1 tablet a serve | mixed compounds | 334.1mgper brand page: the brand’s product page | 285.1mg from 3 of 4 compounds346.7 × 0.603 + 242 × 0.2066 + 161.3 × 0.1616 = 285.150 mg can’t be checked |
mostly adds up · 85 % | no testing claim found | $0.037 | 12c a tablet | Regular price $30.99 · 250 tabletsChemist Warehouse · 27 Oct 2026 | |
| 3 | Nature's Own High Strength Magnesium (350 mg elemental per tablet)Mixed compounds3rd lowest cost per 100 mg of 7 blends; mostly adds up (93 %); AUST L 394052; 1 tablet a serve | mixed compounds | 350mgper brand page: the brand’s product page | 336.7mg from 2 of 3 compounds515.5 × 0.603 + 217.4 × 0.1189 = 336.725 mg can’t be checked |
mostly adds up · 93 % | no testing claim found | $0.075 | 26c a tablet | RRP $39.49 · 150 tabletsChemist Warehouse · 27 Oct 2026 | |
| 4 | Nature's Own Magnesium Glycinate (150 mg elemental per tablet)Glycinaterecall noticeLowest cost per 100 mg of 4 glycinates; figures can’t be double-checked; AUST L 464493; 1 tablet a serve | glycinate | 150mgper brand page: the brand’s product page | Can’t checkonly the magnesium figure givenwhy? | can’t check: no compound weight | no testing claim found | $0.10 | 15c a tablet | Regular price $44.99 · 300 tabletsChemist Warehouse · 27 Oct 2026 | |
| 5 | Blackmores Magnesium Glycinate (150 mg elemental per tablet)Glycinate2nd lowest cost per 100 mg of 4 glycinates; figures add up; AUST L 520466; 1 tablet a serve | glycinate | 150mgper brand page: the brand’s product page | 155.1mg1,100 × 0.141 = 155.1 |
adds up | no testing claim found | $0.15 | 22c a tablet | Regular price $43.99 · 200 tabletsChemist Warehouse · 27 Oct 2026 | |
| 6 | Swisse Ultiboost Magnesium (150 mg elemental per tablet)CitrateLowest cost per 100 mg of 2 citrates; figures can’t be double-checked; AUST L 355159; 1 tablet a serve | citrate | 150mgper brand page: the brand’s product page | Can’t checkonly the magnesium figure givenwhy? | can’t check: no compound weight | no testing claim found | $0.21 | 31c a tablet | RRP $37.49 · 120 tabletsChemist Warehouse · 27 Oct 2026 | |
| 7 | Fusion Magnesium Advanced (400 mg elemental per 2-tablet dose)Mixed compounds4th lowest cost per 100 mg of 7 blends; mostly adds up (70 %); no AUST L number on record yet; 2 tablets a serve | mixed compounds | 400mgper brand page: the brand’s product page | 284.4mg from 3 of 4 compounds982 × 0.141 + 778 × 0.1616 + 300 × 0.0674 = 284.4120 mg can’t be checked |
mostly adds up · 70 % | no testing claim found | $0.23 | 93c a serve | RRP $55.99 · 120 tabletsChemist Warehouse · 27 Oct 2026 | |
| 8 | Thompson's Organic Magnesium (174.9 mg elemental per tablet)Mixed compoundsJoint 5th lowest cost per 100 mg of 7 blends; figures can’t be double-checked; no AUST L number on record yet; 1 tablet a serve | mixed compounds | 174.9mgper brand page: the brand’s product page | Can’t checkblend includes an unnamed chelatewhy?8 % of the magnesium checked; that part adds up | can’t check: compound unclear | no testing claim found | $0.27 | 48c a tablet | RRP $23.79 · 50 tabletsChemist Warehouse · 27 Oct 2026 | |
| 9 | BioCeuticals Ultra Muscleze (powder, 6 g dose)Mixed compoundsHighest cost per 100 mg of 7 blends; figures can’t be double-checked; no AUST L number on record yet; 1 scoop a serve | mixed compounds | 280.2mgper brand page: the brand’s product page | Can’t checkblend includes an unnamed chelatewhy?13 % of the magnesium checked; that part adds up | can’t check: compound unclear | no testing claim found | $0.39 | $1.10 a scoop | Regular price $65.99 · 360 gChemist Warehouse · 27 Oct 2026 | |
| 10 | Blackmores Magmin 500mgAspartateOnly aspartate here; figures add up; AUST L 220238; 1 tablet a serve | aspartate | 37.4mgper brand page: the brand’s product page | 37.5mg500 × 0.0749 = 37.5 |
adds up | no testing claim found | $0.54 | 20c a tablet | RRP $50.49 · 250 tabletsChemist Warehouse · 27 Oct 2026 |
No product matches these filters.
“Label says” is the magnesium per serve from the source we read: the pack, the brand’s page or a shop listing. “Our maths” is the compound weight × its share of magnesium. “Adds up” means the two are within 15 %. Cost per 100 mg uses the stated magnesium and the newest RRP or regular price seen at Chemist Warehouse. “Price used” is that price, with its pack and date. We don’t use sale or member prices. No RRP or regular price yet? Then there’s no cost, and the product sorts last. Prices older than 35 days say “may have changed”. What the marks mean. How we work out each figure.
Each product page shows every shop we checked, with the full price history. Prices here are what Chemist Warehouse showed; another shop may be lower. Other retailers.