Magnesium Chloride is a mineral supplement used to treat low magnesium. Learn its uses, proper dosage, who should avoid it, and what it costs in 2026.
Magnesium Chloride is a mineral and electrolyte supplement used to treat and prevent hypomagnesemia — a condition where your body doesn't have enough magnesium.
Magnesium Chloride (chemical formula MgCl₂) is a naturally occurring mineral compound that provides your body with magnesium, one of the most essential minerals for human health. It's available under brand names like Slow-Mag, Mag-64, Chloromag, and Mag Delay, as well as various generic versions.
Magnesium Chloride belongs to the class of mineral and electrolyte supplements. Unlike some other forms of magnesium (like magnesium oxide), Magnesium Chloride is known for being well-absorbed by the body and relatively gentle on the stomach.
It comes in several forms:
To understand how it works at the cellular level, see our guide on how Magnesium Chloride works.
Doctors and patients also use Magnesium Chloride for:
Magnesium Chloride is not a controlled substance, and most oral forms are available without a prescription. If you need help finding a doctor for a prescription-strength or injectable form, see our guide on finding a doctor who can prescribe Magnesium Chloride.
How you take Magnesium Chloride depends on the form:
Over-the-counter Magnesium Chloride tablets typically contain 64 to 143 mg of elemental magnesium per tablet. Follow the dosing instructions on the label unless your doctor says otherwise.
For information on potential side effects, read our side effects guide.
Magnesium Chloride is not safe for everyone. You should avoid it or use it only under medical supervision if you have:
Magnesium Chloride also interacts with several medications, including tetracycline antibiotics, bisphosphonates, quinolone antibiotics, digoxin, and levothyroxine. Always tell your doctor and pharmacist about everything you're taking.
Magnesium Chloride is one of the more affordable supplements available:
Most OTC Magnesium Chloride is not covered by insurance since it doesn't require a prescription. However, injectable forms used in clinical settings are usually covered under medical benefits. Some FSA and HSA accounts may cover OTC magnesium with a Letter of Medical Necessity.
Generic versions are widely available and work just as well as brand-name products. For more on saving money, see our savings and coupon guide.
Magnesium Chloride is a well-absorbed, affordable magnesium supplement used by millions of people to treat or prevent low magnesium levels. It comes in multiple forms — from easy-to-swallow delayed-release tablets to injectable solutions for severe cases — and is available both over the counter and by prescription.
The most important things to remember: take it with food, don't exceed your recommended dose, and talk to your doctor if you have kidney disease or take medications that may interact with magnesium.
Looking for Magnesium Chloride near you? Search Medfinder to check real-time pharmacy availability.
You focus on staying healthy. We'll handle the rest.
Try Medfinder Concierge FreeMedfinder's mission is to ensure every patient gets access to the medications they need. We believe this begins with trustworthy information. Our core values guide everything we do, including the standards that shape the accuracy, transparency, and quality of our content. We’re committed to delivering information that’s evidence-based, regularly updated, and easy to understand. For more details on our editorial process, see here.
%2C%20Color%3DOriginal.png)
