Products / Magnesium / Aspartate
Blackmores Magmin 500mg
One tablet gives you 37.4 mg of magnesium. The figures add up. It costs $0.54 per 100 mg at the RRP.
adds up no testing claim found
Compare with another productMagnesium aspartate
What the brand’s product page says
- Compound, as written
- “Magnesium aspartate dihydrate 500 mg, equivalent magnesium 37.4 mg”
- Compound per serve
- 500 mg
- Magnesium per serve
- 37.4 mg
- Serve
- 1 tablet, 250 serves per pack, tablet
- Register entry
- AUST L 220238 · ARTG entry (opens in a new tab)AUST L: listed on the national register of medicines (ARTG). Its ingredients and claims come from approved lists. The TGA, the regulator, didn’t evaluate this product itself before sale.
- Read from
- Blackmores product page (opens in a new tab) (brand site), read 27 Oct 2026
How much of the compound is magnesium
Only part of each compound is magnesium. Here’s that share for each one. Some compounds come in several versions, for example with water in the crystals. Each version has its own share.
- Magnesium aspartate: 7.5 % magnesiumThe brand’s product page names this version (“dihydrate”), so we use its share.
Our maths
Magnesium aspartate 500 mg → about 37.5 mg magnesium ✓
Show the chemistry
500 mg × 0.0749 = 37.5 mgVersion used: magnesium aspartate dihydrate (Mg(C4H6NO4)2.2H2O, molar mass 324.53 g/mol, the hydrate commonly printed on Australian labels), share 0.0749. reference (opens in a new tab)
Other versions: magnesium aspartate, anhydrous 0.0842; magnesium aspartate tetrahydrate 0.0674.
Do the figures agree?
stated 37.4 mg vs our maths 37.5 mgdifference -0.1 % (band ±15 %)adds up
Yes. The brand’s product page gives 500 mg of compound and 37.4 mg of magnesium per serve. Our maths: 500 mg × 0.0749 = about 37.5 mg. That’s within 15 % of the stated figure. Why it matters to you: the cost per 100 mg rests on figures that agree. It isn’t a lab test of what’s inside, but it’s the check a label can pass.
Third-party testing
no testing claim found
No testing claim or certificate on the brand’s product page. That’s true of most products here, and it isn’t a mark against this one. The TGA doesn’t check each product before it goes on sale. If batch testing matters to you, ask the brand.
Our note: Neither the brand’s page nor the Chemist Warehouse listing mentions testing (both read 27 Oct 2026). We looked for a HASTA (Human and Supplement Testing Australia) or Informed Sport listing or certificate naming this brand, and found none.
Prices, and what the magnesium costs
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.
Price used: RRP $50.49 · 250 tablets · Chemist Warehouse · 27 Oct 2026.
$50.49 ÷ 250 serves = 20.2c a tablet20.2c ÷ 37.4 mg × 100 = $0.54 per 100 mg of magnesiumWe use the stated magnesium, not our maths, because that’s the figure you’re given. The price used is the lowest current RRP or regular price we’ve seen, at any shop. The list starts with the lowest current cost per 100 mg; earlier prices follow. Rows marked “Earlier observation (price type not recorded)” were seen up to 27 Oct 2026, before we switched to RRP. Some were sale prices. They stay here, greyed, as history, and no figure uses them.
| Retailer | Price type | Price and pack | Per serve | Per 100 mg | Seen | Note |
|---|---|---|---|---|---|---|
| Chemist Warehouse (opens in a new tab)price used above | RRP | $50.49 for 250 tablets | 20c | $0.54 | 27 Oct 2026 | Page prints "Don't Pay RRP $50.49" and '$10.50 Off RRP'; selling price shown was $39.99 (not used). |
| Chemist Warehouse (opens in a new tab)not used | Earlier observation (price type not recorded) | $39.99 for 250 tablets | not used | not used | 27 Oct 2026 | '$10.50 Off RRP', 'Don't Pay RRP $50.49'. No member price shown. The 26 Oct 2026 observation was $25.24 against the same RRP. |
| Chemist Warehouse (opens in a new tab)not used | Earlier observation (price type not recorded) | $25.24 for 250 tablets | not used | not used | 26 Oct 2026 | '$25.25 Off RRP', 'Don't Pay RRP $50.49'; half-price sale. |
Notes
The brand’s page directs 9 tablets a day for women, 11 for men; we count one as a serve. ARTG entry 220238 was active, opened 27 Oct 2026; your pack’s number shows if PBS entry 220242 (not opened) applies.
Corrections
- 27 Oct 2026: Label source changed from the Chemist Warehouse listing (Chemist Warehouse listing, 250 tablets (opens in a new tab)) to the brand's own product page (Blackmores product page (opens in a new tab)), read 27 Oct 2026; a brand's page ranks above a retailer listing. Figures unchanged: magnesium aspartate dihydrate 500 mg, magnesium 37.4 mg per tablet. Compound wording changed from 'Magnesium aspartate dihydrate 500 mg (Magnesium 37.4 mg)' to the brand page's 'Magnesium aspartate dihydrate 500 mg, equivalent magnesium 37.4 mg'.
Sources we opened
- Chemist Warehouse listing, 250 tablets (opens in a new tab)
- Blackmores product page (opens in a new tab)
Added 26 Oct 2026. Figures last read 27 Oct 2026.