Comparison of the elemental magnesium content in magnesium supplements

	Brand name examples (United States)	Molecular weight (g/mol)	Dose as magnesium salt(milligrams)	Route	Elemental magnesium per dose (mmol)	Elemental magnesium per dose (milligrams)	Number of doses daily for RDA*
Magnesium oxide	Uro-Mag	40	140	Oral	3.5	84.5	5
Magnesium oxide	Mag-Ox	40	400	Oral	10	241	2
Magnesium chloride (hexahydrate)^¶	Slow-Mag MagDelay	203	600	Oral	2.9	72	4
Magnesium chloride (hexahydrate)^¶	Mag-SR Slow Magnesium	203	535	Oral	2.6	64	5
Magnesium L-lactate (dihydrate)^¶	Mag-Tab SR	238	833	Oral	3.5	84	4
Magnesium carbonate	Magonate	84	1000 mg/5 mL solution	Oral	2.4	54	6
Magnesium sulfate (heptahydrate)^¶	N/A	246	1000	Intravenous (IV)	4	98	N/A

N/A: not applicable; RDA: recommendary dietary allowance.
* Approximately 300 mg elemental magnesium in adult females and 400 mg elemental magnesium in adult males per day.
¶ Elemental content shown is for hydrate form available in United States and some other countries. Products with different hydrates are available in some other countries. Those products can have different elemental magnesium content than listed above; consult local labeling.

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Comparison of the elemental magnesium content in magnesium supplements