Magnesium carbonate is magnesium bound to carbonic acid, an inorganic form with a relatively high elemental magnesium concentration. In the stomach, it reacts with gastric acid and converts to magnesium chloride, which is then absorbed in the intestine. This reaction gives carbonate a mild antacid effect, making it a popular choice for people who also experience occasional acid discomfort. Bioavailability is moderate — lower than organic chelated forms like glycinate or citrate, but higher than oxide in some studies. Labels show the elemental magnesium content (what your body uses) and sometimes the compound weight. Some products may list 'magnesium hydroxy carbonate' as the specific compound form. This page compares products by elemental magnesium content. Products below are ranked by cost at your chosen daily dose.
Read our Magnesium Carbonate price comparison guide for tips on what to look for when buying magnesium carbonate.
| # | Product | 30-day cost | Supply | Sticker | |
|---|---|---|---|---|---|
| 1 |
Pure Original Ingredients Magnesium Carbonate, Magnesium Supplement, Non-GMO, Multi-Purpose (2 Pound)
PURE ORIGINAL INGREDIENTS Store
|
$0.37 | 567d | $22.49 | View on Amazon |
| 2 |
Pure Original Ingredients Magnesium Carbonate (1 lb) Magnesium Supplement, Non-GMO, Multi-Purpose
PURE ORIGINAL INGREDIENTS Store
|
$0.51 | 283d | $15.49 | View on Amazon |
| 3 |
Pure Original Ingredients Magnesium Carbonate (8oz) Magnesium Supplement, Non-GMO, Multi-Purpose
PURE ORIGINAL INGREDIENTS
|
$0.66 | 141d | $9.99 | View on Amazon |
| 4 |
BulkSupplements.com Magnesium Carbonate Powder - Magnesium Supplement, Mag Carbonate Powder - Pure Magnesium, Gluten Free, 875mg (210mg Magnesium) per Serving, 500g (1.1 lbs)
BulkSupplements Store
|
$1.10 | 314d | $20.97 | View on Amazon |
| 5 |
Pure Original Ingredients Magnesium Carbonate (4oz) Magnesium Supplement, Non-GMO, Multi-Purpose
PURE ORIGINAL INGREDIENTS
|
$1.13 | 71d | $8.49 | View on Amazon |
| 6 |
BulkSupplements.com Magnesium Carbonate Powder - Magnesium Supplement, Mag Carbonate Powder - Pure Magnesium, Gluten Free, 875mg (210mg Magnesium) per Serving, 250g (8.8 oz)
BulkSupplements Store
|
$1.78 | 157d | $16.97 | View on Amazon |
| 7 |
2 Pack Magnesium Carbonate 500mg Gummies, High Absorption Magnesium Supplement for Adults - Support Muscle Function, Vegan, Sugar Free, Raspberry Flavor, 120 Count
Youlikee Store
|
$6.50 | 75d | $12.99 | View on Amazon |
| 8 |
Planetbee Magnesium Carbonate Capsules, 500 mg Magnesium Supplement for Men & Women, Normal Muscle & Nerve Function Support, 90 Capsules
Planetbee
|
$6.66 | 113d | $19.99 | View on Amazon |
| 9 |
duwhot Magnesium Carbonate 500mg, High Absorption Supplement for Digestive Health, Muscle & Nerve Function, 3 Month Supply, Vegan, Non-GMO, Gluten-Free, 90 Capsules
duwhot Store
|
$7.33 | 113d | $21.99 | View on Amazon |
| 10 |
Magnesium Carbonate 500mg Gummies, High Absorption Magnesium Supplement for Adults - Support Muscle Function, Vegan, Sugar Free, Raspberry Flavor, 60 Count
Youlikee Store
|
$8.99 | 38d | $8.99 | View on Amazon |
| 11 |
Greenshoots Magnesium Carbonate Capsules, Daily Magnesium Supplement for Adults, Gluten-Free, 90 Capsules
Greenshoots Store
|
$10.66 | 28d | $15.99 | View on Amazon |
| 12 |
Magnesium Carbonate 500mg Gummies, Magnesium Supplement for Muscle & Digestive Support, High Absorption Formula, Vegan, Pineapple Flavor, 60 Chewables
GREABBY Store
|
$19.99 | 38d | $19.99 | View on Amazon |
Use the elemental magnesium line from "Magnesium (as magnesium carbonate)" rather than the magnesium carbonate compound weight. Labels reviewed for this update included powders, tablets, and formulas where carbonate appears alongside other magnesium forms.
Cost changes with elemental magnesium per serving, powder versus tablet convenience, and whether the product is pure carbonate or a multi-form magnesium blend. Effervescent or specialty formats can cost more than plain mineral products.
Do not compare carbonate compound weight to elemental magnesium. Also check whether carbonate is the only magnesium form; if a blend does not break out each form, it may not support a clean carbonate-specific comparison.
Magnesium carbonate has moderate evidence context as a magnesium source, though it is less researched as a standalone supplement than citrate or glycinate. TrueServing compares labeled elemental magnesium cost at 400 mg/day.
TrueServing participates in the Amazon Associates program. We may earn a commission when you purchase through our links at no extra cost to you. Prices are updated regularly but may vary.