Magnesium citrate and magnesium glycinate are the two most commonly recommended forms for sleep, but they work differently and suit different people. If you've been told to "take magnesium for sleep" without knowing which type, this comparison will help you choose.
Quick Comparison
| Magnesium Citrate | Magnesium Glycinate | |
|---|---|---|
| Bioavailability | Good (higher than oxide, lower than glycinate) | Excellent (among the highest of all forms) |
| Digestive effects | Mild laxative effect at higher doses | Very gentle, rarely causes digestive issues |
| Bonus benefits | Can help with constipation | Glycine amino acid adds its own calming effects |
| Best for | General supplementation, people who also want digestive regularity | Sleep-specific use, sensitive stomachs |
| Cost | Generally less expensive | Slightly more expensive |
| Common doses | 200-400mg elemental magnesium | 200-400mg elemental magnesium |
Magnesium Citrate for Sleep
Magnesium citrate is magnesium bound to citric acid. It dissolves well in water and has good absorption rates, making it one of the more bioavailable forms available at an affordable price point. It supports sleep through the same mechanism as all magnesium forms: activating GABA receptors and promoting muscle relaxation.
The main consideration is its osmotic laxative effect. At doses above 200 to 300mg, some people experience loose stools. For many, this is mild and manageable. For others, especially those taking it right before bed, it can be disruptive.
Sandland Stay Asleep uses magnesium citrate as part of a multi-ingredient formula alongside valerian root and L-theanine. In a combined formula, the magnesium dose is calibrated to avoid digestive effects while still supporting GABA activity.
Magnesium Glycinate for Sleep
Magnesium glycinate (also called magnesium bisglycinate) is magnesium bound to the amino acid glycine. This chelated form has two advantages: higher bioavailability than citrate, and the glycine itself has calming properties. Glycine acts as an inhibitory neurotransmitter and has been independently studied for sleep support.
The combination makes glycinate arguably the best single-ingredient magnesium supplement specifically for sleep. It's well-tolerated at higher doses without the laxative effect, making it the better choice for people with sensitive stomachs or who want a higher magnesium dose.
Which Should You Choose?
Choose magnesium citrate if: you want an affordable, well-absorbed option and don't have digestive sensitivity. It's also a reasonable choice if you deal with occasional constipation, since the mild osmotic effect can be a benefit rather than a drawback.
Choose magnesium glycinate if: sleep is your primary goal, you want the bonus calming effect of glycine, you have a sensitive stomach, or you want to take a higher dose without digestive concern.
Either form works for sleep. The differences are real but modest. Consistent nightly use matters more than which form you pick. Both are dramatically better than magnesium oxide, which has roughly 4% bioavailability and is essentially a laxative.
What About Other Forms?
Magnesium L-threonate: The only form shown to cross the blood-brain barrier effectively. More expensive, less studied specifically for sleep, but potentially useful for cognitive support alongside sleep. Used in the Momentous Sleep Pack.
Magnesium oxide: Cheap and widely available but poorly absorbed (~4% bioavailability). Not recommended for sleep supplementation.
Magnesium taurate: Combines magnesium with taurine. Some evidence for cardiovascular benefits. Less studied for sleep than glycinate or citrate.
For a detailed breakdown of all forms, dosage, and timing, see our complete magnesium for sleep guide.
