Magnesium price per mg — cheapest first

The magnesium figure on a label is elemental magnesium, not the weight of the source compound. How much of that compound is magnesium varies by form: about 60% for magnesium oxide, about 16% for magnesium citrate. In other words, the raw weight needed to deliver the same 100mg of elemental magnesium differs by form, and the price per mg on this page is calculated on elemental magnesium regardless of which form it is.

Price per mg ranges from a low of $0.000079/mg to a median of $0.007774/mg. The median is 98× the lowest, so the cost of the same 1mg of Magnesium spreads by a double-digit multiple across products. That means the per-unit gap between products near the top and the middle of the ranking is that large.

Price per mg is computed for 3,316 of the 3,548 listed (93%). The rest, missing a sale price or amount, are placed at the bottom of the ranking and excluded from the statistics above.

The Magnesium amount per serving ranges from 0.04mg to 2,753mg, with a median of 100mg. The maximum is 28× the median, so high-dose singles and blends listing a small Magnesium amount sit in the same table.

The products in this list come from 530 brands, and the sort order is determined solely by price per mg.

Products classified by label form notation number 1,814 (51% of the total), and the most frequently noted form is Magnesium oxide with 574. Products with no form notation, or whose notation does not match the classification rules, do not appear on the per-form pages, so the per-form product counts sum to less than the total product count above.

Magnesium-only products share this list with multi-mineral blends that pair magnesium with calcium, zinc and others. For a blend, the price per mg charges the entire product price to magnesium, so the cost of the other minerals is folded into that unit price. Powders also measure a serving by the scoop, so their price per serving does not mean the same thing as a tablet product’s.