Magnesium Glycinate vs Magnesium Citrate: Which Form Is Right for You?

Magnesium is involved in over 300 enzymatic reactions, but not all magnesium supplements are created equal. The form you choose — glycinate vs citrate — dramatically changes what the supplement does in your body.

The Core Difference

Glycinate is magnesium bound to glycine, an amino acid known for calming the nervous system. It is highly bioavailable and gentle on the digestive tract.

Citrate is magnesium bound to citric acid. It is well-absorbed but draws water into the intestines at higher doses, producing a laxative effect.

Absorption & Bioavailability

Both forms outperform magnesium oxide (which has ~4% bioavailability), but they serve different goals:

• Glycinate: ~40% absorption, minimal GI side effects, ideal for sleep and relaxation
• Citrate: ~30% absorption, good for repletion and regularity, laxative at high doses

When to Choose Glycinate

• Your goal is sleep quality or stress reduction
• You have a sensitive stomach
• You are taking magnesium long-term without GI issues
• You want the calming effect of glycine itself

When to Choose Citrate

• You need constipation relief (the osmotic laxative effect is the feature, not a bug)
• You want a budget-friendly form for general repletion
• You are correcting a measured deficiency quickly

Timing

Both forms can be taken in the evening. Glycinate 30–60 minutes before bed supports sleep onset. Citrate is best taken with water and can be split across the day.

The Bottom Line

Choose glycinate for sleep and calm, citrate for regularity and budget repletion. If you want both, some users alternate: glycinate at night, citrate in the morning.

Related: Use our Stack Checker to see how your magnesium interacts with other supplements you take.