Magnesium blends (mixed compounds)

A blend has more than one magnesium compound, each with its own share. Blends are harder to check, but cost per 100 mg still compares them with anything else.

See the 7 products Work out any label

What it is

A product with two or more magnesium compounds, such as oxide with citrate. Words like “complex” or “buffered” may or may not mean a blend. The panel will tell you.

How we check a blend

We check each part on its own, then add them up.

One part often can’t be checked, usually an “amino acid chelate” with no amino acid named. If every other part adds up, and they make at least 50 % of the magnesium, it “mostly adds up”.

What to check on the label

How many magnesium lines there are, and the magnesium on each.
Which compound gives most of the magnesium. In several blends here, it’s oxide.
Whether a total is printed, and what it’s per.

Why it matters to you: if the form matters, look at which compound gives most of the magnesium, not which is named first. Oxide-heavy blends tend to cost least per 100 mg. That’s chemistry, not a recommendation. Whether a blend suits you is a question for a pharmacist.

Every blend listed, by cost per 100 mg

3 of 7 could be checked against their own figures: 0 fully, 3 mostly (why the others can’t be). None links a test document yet (what that means).

Sorted by cost per 100 mg of magnesium, lowest first, until you sort. 7 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.

How to read this list

“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.

Sort by cost per 100 mg to see what the magnesium itself costs.
Open a form page to compare like with like.
Tick two products to see them side by side, or open one to see the working.

Magnesium blends (mixed compounds): stated magnesium, our maths, whether it adds up, testing and cost per 100 mg of magnesium, lowest cost first
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	Compare Cenovis Mega Magnesium (325 mg elemental per tablet)
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 compounds`346.7 × 0.603 + 242 × 0.2066 + 161.3 × 0.1616 = 285.1`50 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	Compare Bioglan Active Magnesium 1000
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 compounds`515.5 × 0.603 + 217.4 × 0.1189 = 336.7`25 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	Compare Nature's Own High Strength Magnesium (350 mg elemental per tablet)
4	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 compounds`982 × 0.141 + 778 × 0.1616 + 300 × 0.0674 = 284.4`120 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	Compare Fusion Magnesium Advanced (400 mg elemental per 2-tablet dose)
5	Ethical Nutrients Mega Magnesium (200 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	200mgper brand page: the brand’s product page	Can’t checkblend includes an unnamed chelatewhy?25 % of the magnesium checked; that part adds up	can’t check: compound unclear	no testing claim found	$0.27	54c a tablet	RRP $32.50 · 60 tabletsCincotta Chemist · 27 Oct 2026	Compare Ethical Nutrients Mega Magnesium (200 mg elemental per tablet)
6	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	Compare Thompson's Organic Magnesium (174.9 mg elemental per tablet)
7	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	Compare BioCeuticals Ultra Muscleze (powder, 6 g dose)

“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 each shop’s newest RRP or regular shelf price. It shows the lowest. “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.