Best Magnesium Oxide
The best magnesium oxide we track, ranked by real cost-per-dose — not paid placements. Across 12 tracked options the typical dose runs $0.07 per serving.
Prices checked Jun 24, 2026
Best valueNature Made Magnesium Oxide 250 mg
<$0.001 per serving — the cheapest magnesium oxide dose we track.
Full ranking by cost per dose
Cost-per-serving normalizes price across bottle sizes — a 60-count and a 365-count compare fairly.
See also: cheapest magnesium oxide per dose · Magnesium Oxide basics
Frequently asked
What is the best-value Magnesium Oxide supplement?+
Nature Made Magnesium Oxide 250 mg — <$0.001 per serving ($0.03 for 200 servings), the lowest cost-per-dose magnesium oxide in our Amazon US catalog as of June 2026.
What is the typical cost per dose for Magnesium Oxide?+
About $0.07 per serving across 12 tracked magnesium oxide products, ranging from $0.05 for the best deals to $0.11 for premium options.
What's the cheapest effective Magnesium Oxide?+
To reach the commonly-studied 300 mg/day dose, Nature Made Magnesium Oxide 250 mg is the best value at <$0.001 per day — cheaper than bottles that look low-priced per serving but are underdosed.