Magnesium oxide price per mg — cheapest first
Ranked 574 Magnesium oxide products by price per mg, cheapest first.
Among listed Magnesium oxide products, the lowest price per mg is NOW Foods, Magnesium Oxide Pure Powder, 8 oz (227 g) at $0.000079 per mg. This value is based on the listed price at the most recent collection and is the lowest within this site's coverage.
Other forms of Magnesium
Price data as of 2026-09-28
How to read this table
How do you read Magnesium oxide label notation?
Magnesium oxide (MgO) is about 60% magnesium by molecular weight, one of the higher elemental shares among magnesium compounds. Since the magnesium figure on a label is that elemental amount, a form with a higher elemental share delivers the same amount from less raw weight. That difference affects tablet size and how many you take a day, but it is already accounted for in the price per mg in this table.
How much does Magnesium oxide pricing vary between products?
Products classified as Magnesium oxide number 574, which is 16% of all 3,548 Magnesium products. Classification is by the label's form notation string; products without notation are placed in no form.
Price per mg for this form ranges from a low of $0.000079/mg to a median of $0.003696/mg. This form's median sits below the overall median for Magnesium ($0.007774/mg). This is an observed price distribution and does not indicate the quality of the form.
The amount per serving ranges from 0.08mg to 1,400mg, with a median of 100mg. The amount is the label-declared Magnesium value, not the raw material weight.
The products of this form come from 161 brands.
Ingredients and amounts shown are label-declared values and do not guarantee any medical benefit such as prevention or treatment of disease. This page makes no judgment that any form or product is better than another; ranking is determined solely by price and label amount. The calculation method and limits are documented in How prices are calculated.