Types of Magnesium Compared: Which Should You Take?
Magnesium is one of the most useful supplements, but the form on the label changes how well it absorbs and what it is best for. Here is a plain guide to the common types so you can match one to your goal.
Key takeaways
- Magnesium glycinate is gentle and well absorbed, popular for calm and sleep.
- Magnesium citrate absorbs well and can help with constipation.
- Magnesium oxide is cheap but poorly absorbed and more likely to loosen stools.
- Threonate is marketed for the brain, with a smaller evidence base.
Why the form matters
Magnesium is always bound to another compound, and that pairing affects how much your body absorbs and what side effects you might notice. Two products can list the same magnesium amount yet behave very differently.
The common forms
Glycinate, magnesium bound to the amino acid glycine, is gentle on the stomach and well absorbed, which is why it is a favorite for relaxation and sleep. Citrate absorbs well too and has a mild laxative effect, making it useful if constipation is a concern. Oxide is inexpensive but poorly absorbed and most likely to cause loose stools. Malate and taurate are other well tolerated options, and threonate is promoted for cognitive support with a smaller research base.
- Glycinate: calm, sleep, gentle digestion
- Citrate: general use, helps constipation
- Oxide: cheap, poorly absorbed
- Threonate: marketed for the brain, less evidence
How to choose
Match the form to your goal. For relaxation and sleep, glycinate is a strong default. If you also want help with regularity, citrate makes sense. Start with the lower end of a dose to gauge tolerance, since too much of any form can cause loose stools.
Frequently asked questions
Glycinate is a popular choice because it is well absorbed and gentle, which suits evening use for relaxation.
Poorly absorbed forms like oxide, and higher doses of any form, draw water into the gut and can loosen stools.
Well absorbed forms like glycinate or citrate are worth choosing over oxide, but you do not need the most expensive product to benefit.
References and Further Reading
How we researched this: Our editorial team reviewed current clinical research and guidance from independent health authorities before writing and reviewing this article. You can verify the science yourself through the sources below.
