Two jars of magnesium malate, both 120 capsules, both around $20. One delivers 400 mg of elemental mineral a day. The other asks for two capsules and lands near 200 mg. Your cost per day is not the same, even though the shelf price is.
You compare jars. Stores compare jars. Neither number tells you what a month of actual use costs you.
Cost per serving is the only figure that survives contact with a daily routine. Learn to build it and every price tag on the shelf becomes readable in about ten seconds.
Why magnesium malate cost per serving beats bottle price
Take the shelf price. Divide it by the number of doses the label describes, not the number of capsules in the jar. A $19.99 tub with 60 doses lands at $0.33 each. A $16.99 tub with 30 doses lands at $0.57 each. The cheaper one is the more expensive one.
That inversion happens constantly in this aisle, so it's worth doing the arithmetic before you get attached to a number on a tag.
Malate shows up in blends too, which complicates the count further. If the label says 500 mg of a blend and malate is one of four ingredients, you cannot assume the malate portion is meaningful. Look for a single-source listing when you can.
Blends are not dishonest. They are simply harder to price, because you cannot isolate what you're paying for.
A dose is what the label tells you to take
The Supplement Facts panel defines the dose. It might be one capsule, two, or three. A 120-count jar with a two-capsule dose holds 60 doses, not 120, and that single line rewrites your entire cost calculation.
Here is a real example. You're scanning a page on your phone at 11 pm, you see 120 count and $18.99, and you buy it. The label calls for two capsules, so you've actually bought 60 days at $0.32 each, which is fine. But when the same brand ships a 240-count size for $24.99 with a three-capsule dose, you're at 80 days and $0.31 each. Nearly identical. The bigger one bought you nothing except more shelf space.
Check the dose before the count. Check the elemental figure before the dose.
What the compound weight hides
Malate is a compound. The milligram figure on the front of a label usually describes the compound, not the elemental mineral your body actually receives. Malate carries roughly 15 percent by weight, so 1000 mg of the compound delivers something in the region of 150 mg of elemental mineral.
Suppliers who list elemental content on the nutrient line make comparison easy. Suppliers who list only the compound weight force you to do division that most shoppers never attempt.
So you're comparing two numbers that mean different things. That is the trap. A 500 mg compound listing can deliver less usable mineral than a 200 mg elemental listing, and the higher number looks stronger.
The limits of this method
Per-serving math does not capture everything. It ignores whether the form suits you, whether the capsule size is one you'll actually swallow daily, and whether the brand ships on a schedule you can rely on. Cheapest per day is meaningless if the container sits unopened.
Subscriptions change the per-order figure and remove the reorder decision, and that has value that does not appear in any per-serving calculation. A $0.40 per day product you actually finish beats a $0.28 per day product you abandon in a drawer.
If you take magnesium under medical supervision, or you're managing a diagnosed condition, run the dose past your clinician before you optimize the price.
Two numbers to keep
Write down the doses per container and the elemental amount per dose. Divide price by the first. Compare the second against whatever daily target you're aiming for.
Do that on three products and the shelf stops being a wall of prices. Pick the one with the lowest cost per day that meets your target, then forget the category for a few months.
Frequently asked questions
How do I compare two bottles?Show answerHide answer
Divide price by servings, then check the servings per day the label asks for.
Is buying larger always cheaper?Show answerHide answer
Usually, but check the per-serving dose has not quietly dropped.
Does subscription change the price?Show answerHide answer
It reduces the per-order figure and removes the reorder decision.
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.
