One 1000 mg magnesium oxide capsule delivers about 603 mg of elemental magnesium, and 1000 mg of magnesium taurate delivers about 85 mg. Both bottles can say 1000 mg on the front. Only one of those numbers reaches the nutrient line, and that's the figure worth comparing when you shop.
What elemental magnesium per serving actually counts
Magnesium never sits in a capsule on its own. It arrives attached to something, and that something has weight. Citrate, oxide, glycinate, taurate, malate, threonate: each partner pulls the total compound weight in a different direction. The Supplement Facts panel reports magnesium separately, in mg, and that's the elemental dose. Everything in the compound weight that isn't magnesium isn't magnesium.
The arithmetic is dull, which is why it gets skipped. Take the elemental percentage, multiply by the compound weight on the label, and you have your real dose. Magnesium oxide runs about 60 percent elemental. Magnesium citrate runs near 11 percent, because the citrate portion is heavy. Glycinate sits around 14 percent, and taurate lands near 8.6 percent.
The forms we stock, and what each one hands you
Our line runs on three formats, and they aren't interchangeable by milligram. The 200 mg magnesium glycinate capsule uses a chelated form, so two capsules give you 400 mg of the mineral across a 120 count bottle. The 500 mg magnesium citrate tablet is the higher-volume daily option for someone who wants one serving and no more, and one tablet supplies about 55 mg, which means the serving count on the label matters more than the tablet count in the bottle. The magnesium oxide 400 mg capsule is the budget tier at 240 mg per capsule.
Here is the part that catches people. A 120 count bottle of 500 mg citrate tablets at two tablets per serving is a 60 serving bottle, so $0.24 per serving. A 120 count bottle of 400 mg oxide capsules at one capsule per serving is $0.11 per serving. The bigger compound weight doesn't buy the bigger nutrient dose. Run that division before you compare shelf prices, and the value ordering flips more often than the front-of-bottle numbers suggest.
Why a bigger milligram figure can mean less nutrient
Magnesium oxide is the cheapest source per gram of the mineral, and it carries the largest compound number per capsule, which is exactly why it dominates the low end of the shelf. Magnesium taurate is the opposite case. 1000 mg of magnesium taurate gives you roughly 85 mg, so a bottle built on taurate needs a much larger capsule or more capsules per serving to match an oxide dose. You're paying for the partner molecule as much as for the mineral.
None of that makes taurate a bad purchase. It makes it a different purchase. People who tolerate oxide poorly sometimes do fine on a chelated form, and the opposite happens too. That's a personal tolerance question, not a quality ranking, and no label can answer it for you.
Reading it in ten seconds in the aisle
Open the panel. Find the row that says magnesium. Read the mg figure in that row. That number is your dose per serving, and the daily value to compare against is 420 mg for adults. Then look at servings per container and divide the price by it. Two moves, no calculator required beyond one division.
Ignore the figure on the front entirely if the panel disagrees with it. The panel is the legal document. The front is a summary written by someone with a design budget.
What the two numbers cost you at checkout
Shelf price follows compound weight, and nutrient dose follows the panel figure. Those two things drift apart, which is why a $12 bottle of oxide can beat a $28 bottle of taurate on cost per gram of the mineral. It also explains why the most expensive capsule on the shelf sometimes carries the smallest nutrient line. Price the nutrient, not the pill.
One limit worth stating plainly: this number tells you how much mineral you swallow, not how much your body absorbs. Absorption varies by form, by dose size, and by whether you took it with food. We list it because it's the only figure on the label you can verify without a lab. It's a starting point for comparison, and it's not a promise about what happens next. If you're on prescription medication, that conversation belongs with your clinician, not with a product page.
Frequently asked questions
How many milligrams should I look for?Show answerHide answer
Read the nutrient line, not the compound weight, and compare it with the daily value.
Does a bigger number mean a stronger product?Show answerHide answer
Not always. A larger compound weight can deliver less of the nutrient itself.
Where is this printed?Show answerHide answer
On the Supplement Facts panel, listed per serving.
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
