Between 0.4 capsules and 6.7 capsules, depending entirely on which product you bought. Nothing on the front of a bottle tells you this, and it is the number most likely to decide whether you keep taking it.
A magnesium capsule here holds anywhere from 30 mg to 500 mg of elemental magnesium. The dose is what your body gets; the unit count is what you have to swallow. Both are computed here from each product's own Supplement Facts panel against a 200 mg comparison dose.
A powder shows as one unit because a scoop is a scoop whatever it weighs, the comparison there is grams, not count. Fractional counts mean one comparison dose does not land on a whole capsule; we report that rather than rounding up, because rounding changes the dose as well as the price.
Where to buy: the pick for each type
The pick is the cheapest certified product, at the exact package sold where the certifier names packages, with no adverse finding on record, a price its retailer let us read recently, and no more than a year’s supply at the label’s serving; per delivered dose where the retailer publishes a delivery rate. Where none does, it is the cheapest such product before delivery, and it says how far the order is from free delivery. It is the same pick the category page shows.
Among 19 products and 19 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 “Delivery known” ranks only products whose retailer publishes a delivery rate; a cheaper product with an unpublished rate is on its own line, or in the full list below.
Among 8 products and 8 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 “Delivery known” ranks only products whose retailer publishes a delivery rate; a cheaper product with an unpublished rate is on its own line, or in the full list below.
Among 9 products and 9 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 “Delivery known” ranks only products whose retailer publishes a delivery rate; a cheaper product with an unpublished rate is on its own line, or in the full list below.
Among 5 products and 5 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. No product here publishes a delivery rate below its free-delivery threshold, so the pick is priced before delivery.
A pick has to be independently certified, at the exact package sold where the certifier names packages, and carry no recall or failed test. Nothing we track here is yet. Each of these misses at least one bar, and says which:
A pick has to be independently certified, at the exact package sold where the certifier names packages, and carry no recall or failed test. Nothing we track here is yet. Each of these misses at least one bar, and says which:
BulkSupplements.com Magnesium Oxide Powder (250 g)$0.028 per 200mg, no independent verification we could locate; delivery cost is not published. Free delivery starts at $59.00, so this order is $38.03 short.
A pick has to be independently certified, at the exact package sold where the certifier names packages, and carry no recall or failed test. Nothing we track here is yet. Each of these misses at least one bar, and says which:
Nutricost Magnesium Malate (180 capsules)$0.143 per 200mg, no independent verification we could locate; delivery cost is not published. Free delivery starts at $59.00, so this order is $41.03 short.
A pick has to be independently certified, at the exact package sold where the certifier names packages, and carry no recall or failed test. Nothing we track here is yet. Each of these misses at least one bar, and says which:
BulkSupplements.com Magnesium Malate Powder (500 g)$0.062 per 200mg (its panel names Magnesium Malate and Magnesium Oxide), no independent verification we could locate; delivery cost is not published. Free delivery starts at $59.00, so this order is $34.03 short.
Among 7 products and 7 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. No product here publishes a delivery rate below its free-delivery threshold, so the pick is priced before delivery.
A pick has to be independently certified, at the exact package sold where the certifier names packages, and carry no recall or failed test. Nothing we track here is yet. Each of these misses at least one bar, and says which:
Micro Ingredients Magnesium Taurate (240 capsules)$0.406 per 200mg, no independent verification we could locate; delivery cost is not published. Free delivery starts at $59.00, so this order is $37.05 short.
A pick has to be independently certified, at the exact package sold where the certifier names packages, and carry no recall or failed test. Nothing we track here is yet. Each of these misses at least one bar, and says which:
BulkSupplements.com Magnesium Taurate Powder (500 g)$0.128 per 200mg, no independent verification we could locate; delivery cost is not published. Free delivery starts at $59.00, so this order is $27.03 short.
What this rests on: prices we last recorded at the retailer named on each product page, which go stale, and each page says when it was checked; the products we track, not every product sold, and Amazon and Walmart are not among the stores; listings and labels read at the source, each linked from the page. Found an error? Tell us. The full method: How we compare.