Magnesium Oxide
Capsules and powders are ranked separately: each has its own table, and neither is priced against the other.
Capsules, softgels and tablets
How these lines are chosen
Among 11 products and 11 retailer listings we track; Amazon and Walmart are not included. A month is thirty doses of the size in the heading, priced the same way as the per-dose figure beside it. “Delivery known” ranks only products whose retailer publishes a delivery rate; a cheaper product with an unpublished rate is on its own line, or in the full list below.
A pick has to be independently certified, at the exact package sold where the certifier names packages, with no recall or failed test, a price its retailer let us read recently, and no more than a year’s supply at the label’s serving. Where a retailer does not publish a delivery rate, the pick is priced before delivery and says so. These came closest, with what stopped each one:
Powder
A pick has to be independently certified, at the exact package sold where the certifier names packages, with no recall or failed test, a price its retailer let us read recently, and no more than a year’s supply at the label’s serving. Where a retailer does not publish a delivery rate, the pick is priced before delivery and says so. These came closest, with what stopped each one:
“Delivery cost is not published” usually means the retailer only publishes a free-delivery threshold and no rate below it. An order that reaches the threshold clears it. We cannot price that cart for you, so we show the gap instead of guessing.
The salt that carries the most magnesium per gram of compound, and the only inorganic one here. A review the cheapest-per-dose page cites found inorganic forms appear less bioavailable than organic ones. Price per dose flatters it, and that is the point of showing it.
Prices are checked daily where a store can be read automatically; Sports Research is read by hand, less often, and a price past its date says so. Every figure links to its source. Where the data comes from
Of the 15 products here: none in any database we searched.
| Product | Delivery | |||||
|---|---|---|---|---|---|---|
BULK BulkSupplements.com Magnesium Oxide Capsules 500 mg (360 count) capsule · 500mg per serving · 0.40 per dose | $0.027 $0.80/mo + delivery | D · None located Could not locate independent data | $23.96 checked today | not free $35.04 short | 360 = 900 doses 2.5 years at 1/day | Buy BulkSupplements.com |
NUTR | $0.033 $1.00/mo + delivery | D · None located Could not locate independent data | $15.97 checked today | not free $43.03 short | 240 = 480 doses 16 months at 1/day | Buy Nutricost (direct) |
NUTR | $0.034 $1.01/mo + delivery | D · None located Could not locate independent data | $16.97 checked today | not free $42.03 short | 240 = 504 doses 17 months at 1/day | Buy Nutricost (direct) |
MI | $0.04 $1.20/mo + delivery | D · None located Could not locate independent data | $23.95 checked today | not free $35.05 short | 500 = 600 doses 20 months at 1/day | Buy Micro Ingredients (direct) |
NM | $0.048 $1.43/mo | C · Claimed Claimed, not confirmed | $11.89 checked today | $8.00 | 200 = 250 doses 8.2 months at 1/day | Buy Nature Made (direct) |
NM | $0.05 $1.49/mo | C · Claimed Claimed, not confirmed | $6.19 checked today | $8.00 | 100 = 125 doses 4.1 months at 1/day | Buy Nature Made (direct) |
NUTR | $0.051 $1.54/mo + delivery | D · None located Could not locate independent data | $12.97 checked today | not free $46.03 short | 240 = 252 doses 8.3 months at 1/day | Buy Nutricost (direct) |
BULK | $0.053 $1.60/mo + delivery | D · None located Could not locate independent data | $23.96 checked today | not free $35.04 short | 180 = 450 doses 15 months at 1/day | Buy BulkSupplements.com |
SR Sports Research Magnesium Oxide, Biolipid Delivery (90 softgels) softgel · 420mg per serving · 0.48 per dose | $0.10 $3.01/mo | D · None located Could not locate independent data | $18.95 stale, checked 10 days ago | $7.50 | 90 = 189 doses 6.2 months at 1/day | Check price Sports Research (direct) |
NM | $0.11 $3.30/mo | D · None located Could not locate independent data | $12.39 checked today | $8.00 | 90 = 113 doses 3.7 months at 1/day | Buy Nature Made (direct) |
NM Nature Made Magnesium Extra Strength 400 mg (60 softgels) softgel · 400mg per serving · 0.50 per dose | $0.119 $3.57/mo | D · None located Could not locate independent data | $14.29 checked today | $8.00 | 60 = 120 doses 3.9 months at 1/day | Buy Nature Made (direct) |
| Product | Delivery | |||||
|---|---|---|---|---|---|---|
BULK BulkSupplements.com Magnesium Oxide Powder (1 kg) powder · 1000 g · 500mg per serving · 0.10 per dose | $0.011 $0.32/mo + delivery | D · None located Could not locate independent data | $31.97 checked today | not free $27.03 short | 1,198 = 2,995 doses 8.2 years at 1/day | Buy BulkSupplements.com |
BULK BulkSupplements.com Magnesium Oxide Powder (500 g) powder · 500 g · 500mg per serving · 0.10 per dose | $0.018 $0.54/mo + delivery | D · None located Could not locate independent data | $26.97 checked today | not free $32.03 short | 599 = 1,498 doses 4.1 years at 1/day | Buy BulkSupplements.com |
BULK BulkSupplements.com Magnesium Oxide Powder (250 g) powder · 250 g · 500mg per serving · 0.10 per dose | $0.028 $0.84/mo + delivery | D · None located Could not locate independent data | $20.97 checked today | not free $38.03 short | 299 = 748 doses 2.0 years at 1/day | Buy BulkSupplements.com |
BULK BulkSupplements.com Magnesium Oxide Powder (100 g) powder · 100 g · 500mg per serving · 0.10 per dose | $0.07 $2.10/mo + delivery | D · None located Could not locate independent data | $20.97 checked today | not free $38.03 short | 120 = 300 doses 9.9 months at 1/day | Buy BulkSupplements.com |
Common questions
About these numbers
What “per dose” means here: 200mg elemental magnesium
The NIH fact sheet gives an adult RDA of 310-420 mg of magnesium, and 200 mg sits below that whole range. It is a round number chosen as a common denominator across salts that carry very different amounts of magnesium per gram. It is a unit of comparison, not a recommended intake.
Compared on elemental magnesium. Oxide carries more magnesium per gram than any common form, which is why it produces a low cost per dose; absorption is a separate question this figure does not answer.
Where the data comes from
- Where a servings-per-container figure was not read from the package's own panel, the product page says how it was worked out.
- Amazon and Walmart are not included, so “cheapest” means cheapest among the retailers we track.
- Prices go stale. Each one shows when it was last checked, and says so when it is older than the retailer allows us to cache it.
- iHerb prices cannot be refreshed automatically. iHerb has not given us access to its price data, so those prices are marked stale until they are re-read. Each retailer offer carries its own check date.
How we make money
No Buy button on this page earns us anything. The only links on the site that can are the Amazon links shown below the price comparison on some product pages, outside the comparison, and each says so beside it.
Commission will play no part in what we list, how it ranks, or which link we send you to. The Buy button points at the lowest price we have recorded even when that retailer pays us nothing.