It can cause diarrhea,[8] nausea, vomiting, severely lowered blood pressure, confusion, slowed heart rate, respiratory paralysis.
[9] In practice, magnesium is given in a salt form together with any of several anionic compounds serving as counter-ions, such as chloride or sulfate.
The citrate is the least expensive soluble (high bioavailability) oral magnesium salt available in supplements, with 100 mg and 200 mg magnesium typically contained per capsule, tablet or 50 mg/mL in solution.
Research on topical magnesium (for example epsom salt baths) is very limited.
[29] Studies have revealed that magnesium sulfate can be nebulized to reduce the symptoms of acute asthma.