VitaminDB Data · October 2026
The real cost of Magnesium, per dose
For the exact same amount of Magnesium — the same mg of active ingredient — the priciest products cost a 13× premium over the cheapest. We measured it across 107 tracked products, normalized to cost per mg.
Is the premium brand worth it?
On price, usually not. Two bottles of Magnesium can carry the identical active dose at wildly different prices — the spread between the cheap and the premium end is 13× per mg, from a low around $0.0001 to a high near $0.0011. A higher sticker price is not a reliable signal of a better product; most of that gap is branding and margin, not more Magnesium. Pay up only for a verifiable difference — third-party testing, or a specific better-absorbed form — never for the packaging.
Right now the best value in our catalog is Magnesium Oxide 400mg, 500 Capsules | Elemental Form for Max… at $0.03 per serving — against a catalog median of $0.183/serving.
How we calculated it
Cost per active unit = price ÷ (servings per container × dose per serving), measured in Magnesium’s dominant dose unit (mg) so we only ever compare like with like — mg of Magnesium against mg of Magnesium.
Spread = the 90th-percentile cost per mg ÷ the 10th-percentile. Using the 10th/90th percentiles (not the absolute min/max) deliberately excludes one-off outliers and mislabeled listings. Based on 107 active Magnesium products from our live Amazon US catalog, recomputed hourly. This is a value comparison, not medical or dosing advice.
Part of the catalog-wide supplement price-spread study (median 7.3× across 75 nutrients).
Free to cite
Quote these figures with a link back to this page. Key data point (as of October 2026): for the same dose of Magnesium, the priciest products cost 13× more than the cheapest per mg, across 107 tracked products.
Magnesium cost FAQ
- How much does Magnesium vary in price for the same dose?
- For the same amount of Magnesium (per mg), the most expensive products cost about 13× more than the cheapest — based on 107 tracked products, comparing the 90th vs 10th percentile cost per mg. The median is $0.0004 per mg.
- Is the premium Magnesium brand worth it?
- On price alone, usually not: the priciest options deliver the same mg of Magnesium for up to 13× the cost. A higher price is not a reliable quality signal — pay more only for a verifiable difference such as third-party testing or a specific better-absorbed form, not for packaging.
- What is the cheapest Magnesium per dose right now?
- Magnesium Oxide 400mg, 500 Capsules | Elemental Form for Max Concentration… at $0.03 per serving is the lowest cost-per-dose Magnesium in our catalog. See the full ranking on the Best Magnesium page.