Can Magnesium Cause Diarrhea? The Surprising Truth

Can Magnesium Cause Diarrhea? The Surprising Truth

Magnesium and Your Digestive System: The Inside Scoop

Magnesium is a mineral that's super important for our bodies. It helps with everything from keeping our muscles and nerves working to making sure our bones are strong. But sometimes, taking magnesium can lead to a bit of a tummy rumble or even diarrhea. Let's dive into why that happens and what you can do about it.

What is Magnesium and Why Do We Need It?

Magnesium is like a tiny helper in our bodies that plays a big role in lots of important jobs. Think of it as a worker that keeps things running smoothly behind the scenes. You can find magnesium in foods like leafy greens, nuts, seeds, and whole grains.

  • Muscle Function: Magnesium helps muscles relax after they contract.
  • Nerve Function: It's involved in sending messages between your brain and your body.
  • Bone Health: Magnesium is important for keeping your bones strong and healthy.
  • Energy Production: It helps turn the food you eat into energy.

Can Magnesium Cause Diarrhea?

So, here's the deal: can magnesium cause diarrhea? The short answer is yes, it can. But it's not the magnesium itself that's the problem. It's usually how much you take and what type of magnesium supplement it is.

How Magnesium Affects Your Gut

When you take a magnesium supplement, especially in large amounts, it can draw water into your intestines. This is called an "osmotic effect." Think of it like a sponge soaking up water. More water in your intestines means softer, looser stools, and sometimes, diarrhea. 

Different Forms of Magnesium

Magnesium supplements come in different forms, and some are more likely to cause diarrhea than others. Here's a quick rundown:

  • Magnesium Oxide: Often used in laxatives, this form is more likely to cause diarrhea because it's not absorbed as well.
  • Magnesium Citrate: Also used for constipation, this form can have a laxative effect in higher doses.
  • Magnesium Glycinate: This form is considered gentler on the stomach and less likely to cause diarrhea because it is better absorbed.
  • Magnesium Chloride: The absorption level is moderate, but still has a slight laxative effect.
  • Magnesium Malate: Less likely to cause diarrhea as it is more gentle on the stomach

Tips for Taking Magnesium

If you're taking magnesium and experiencing diarrhea, here are a few things you can try:

  • Start Low, Go Slow: Begin with a small dose and gradually increase it to see how your body reacts.
  • Take with Food: Taking magnesium with a meal may help reduce digestive upset.
  • Choose a Different Form: If one form causes problems, try another, like magnesium glycinate or malate.
  • Stay Hydrated: Drinking plenty of water is always a good idea, especially when taking supplements.

Why Form and Dosage Matters

The form of magnesium you take is important because different forms are absorbed differently by your body. Some forms, like magnesium oxide, aren't absorbed very well, which means more of it stays in your intestines and draws in water. Dosage matters too. The recommended daily allowance (RDA) of magnesium varies by age and gender, but it's generally around 310-420 mg for adults. Taking more than that, especially in supplement form, increases the risk of diarrhea.

Comparing Magnesium Forms

Magnesium Form Absorption Diarrhea Risk
Magnesium Oxide Low High
Magnesium Citrate Moderate Moderate
Magnesium Glycinate High Low
Magnesium Chloride Moderate Moderate
Magnesium Malate High Low
References
  1. Schuchardt, J. P., & Hahn, A. (2017). Intestinal absorption and factors influencing bioavailability of magnesium-an update. Current nutrition & food science, 13(4), 260-278. https://pubmed.ncbi.nlm.nih.gov/29123461/
  2. Fine, K. D., Santa Ana, C. A., Porter, J. L., & Fordtran, J. S. (1991). Intestinal absorption of magnesium from food and supplements. The Journal of Clinical Investigation, 88(2), 396–402. https://pubmed.ncbi.nlm.nih.gov/1864954/
  3. Blancquaert, L., Vervaet, C., & Derave, W. (2019). Predicting and Testing Bioavailability of Magnesium Supplements. Nutrients, 11(7), 1663. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6683096/

Disclaimer

The information provided in this article is for informational and educational purposes only and is not intended as a substitute for professional medical advice, diagnosis, or treatment. Statements regarding health benefits have not been evaluated by the Food and Drug Administration or Health Canada. This information does not claim to diagnose, treat, cure, or prevent any disease. Always consult with a licensed healthcare professional before starting any new supplement, treatment, or health regimen. We do not assume any responsibility for adverse effects, outcomes, or damages resulting from the use or reliance on the information provided. Health-related discussions in this article are general in nature and are not indicative of the efficacy or intended use of our products.