Magnesium Hydroxide: Uses, Benefits, and What You Need to Know

When you reach for a bottle of milk of magnesia to calm a sour stomach or ease constipation, you’re using magnesium hydroxide, a simple compound used for decades to neutralize stomach acid and stimulate bowel movements. Also known as Mg(OH)₂, it’s one of the most straightforward and widely available remedies for digestive discomfort. Unlike fancy new supplements or prescription drugs, magnesium hydroxide works the old-fashioned way—by drawing water into the intestines and lowering acid levels without complex chemistry.

This compound isn’t just a quick fix. It’s a core part of how many people manage everyday gut issues. You’ll find it in over-the-counter antacids, laxatives, and even some combination products for heartburn and gas. It’s often compared to calcium carbonate and aluminum hydroxide, but magnesium hydroxide has a unique balance: it works faster than calcium carbonate and causes less constipation than aluminum-based options. That’s why it’s a go-to for people who need relief from both acid reflux and occasional constipation. It’s also used in some magnesium supplements, especially for those who struggle to get enough from food alone.

It’s not just about swallowing a tablet. Magnesium hydroxide’s effects depend on dosage and timing. Too much can lead to diarrhea, while too little won’t help at all. It’s safe for most adults when used as directed, but if you’re on kidney medication or have heart conditions, you should check with a doctor first. Unlike some newer gut meds, it doesn’t hide behind brand names—it’s the same active ingredient whether it’s sold as Milk of Magnesia, a generic version, or even a store brand.

What you’ll find in the posts below isn’t just a list of articles. It’s a collection of real comparisons and practical insights. You’ll see how magnesium hydroxide stacks up against other common remedies like calcium carbonate for skin and stomach use, how it fits into broader digestive health strategies, and how people use it in everyday life—not just as a quick fix, but as part of a smarter routine. Whether you’re trying to avoid heartburn after dinner, manage occasional constipation, or understand what’s really in that little blue bottle on your shelf, these posts give you the facts without the fluff.