Magnesium Glycinate vs Citrate: Which Should You Take?

Comparison Guide · Updated 2025

Magnesium Glycinate vs Citrate: Which Form Is Best?

Magnesium glycinate and magnesium citrate are both well-absorbed forms, but they serve different purposes. The choice depends on what you’re trying to achieve.

Magnesium Glycinate: Best for Sleep, Anxiety, and Long-Term Use

Magnesium glycinate is magnesium chelated with glycine (an amino acid). This combination provides two benefits simultaneously: magnesium corrects deficiency and supports GABA activity; glycine independently promotes sleep quality via NMDA receptor modulation and core body temperature reduction.

Glycinate has the lowest GI side effect profile of all magnesium forms — it does not cause the laxative effect that makes some other forms poorly tolerated. This makes it ideal for nightly use long-term. It has the highest bioavailability among oral forms (~80% relative to glycinate standard).

Best for: Sleep quality, anxiety reduction, PMS, long-term magnesium repletion, nightly use. Dose: 300–400mg elemental magnesium (check label — the mg on the front is often the compound weight, not elemental), 30–60 min before bed.

Magnesium Citrate: Best for Constipation, Lower Cost

Magnesium citrate is magnesium bound to citric acid. It has good bioavailability (~66%) and works as an osmotic laxative at higher doses (typically 240–480mg elemental magnesium). At lower doses, it functions as a general magnesium supplement without causing loose stools.

Citrate is significantly cheaper than glycinate and works well for general magnesium status. The downside: GI discomfort and loose stools are more common, especially at doses above 200mg elemental. This limits its utility for daily nightly use in sleep protocols.

Best for: Constipation relief, budget-conscious supplementation, general magnesium deficiency where sleep promotion is not the primary goal. Dose: 100–200mg elemental for daily supplementation; 300–500mg elemental for acute constipation.

Other Forms: Oxide, Malate, L-Threonate

Magnesium oxide: Cheapest, worst absorption (~4%). The most common form in cheap supplements — avoid it for supplementation purposes. Fine for antacid use.
Magnesium malate: Good bioavailability, often recommended for energy/fatigue due to malate’s role in the Krebs cycle. Useful for athletes or those with chronic fatigue.
Magnesium L-threonate: Best for brain-specific effects (crosses blood-brain barrier). Most expensive. Use if cognitive enhancement is your primary goal.

The Verdict

Choose glycinate if your goal is sleep quality, anxiety, or long-term nightly use. Choose citrate if your goal is constipation relief or you want the cheapest effective option. Both are significantly better than oxide.

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