Can You Take Magnesium and Phosphorus Together?

Dose or timing may matter

The short answer

High phosphorus intake can complex with magnesium in the GI tract, forming insoluble magnesium phosphate, and also increases renal magnesium excretion, potentially leading to magnesium depletion.

How to arrange timing

Balance phosphorus and magnesium intake; avoid excessive phosphorus supplements if magnesium status is low.

Reference

Reference noted for this combination: Rude RK. Magnesium deficiency: a cause of heterogeneous disease in humans. J Bone Miner Res. 1998;13(4):749-758

Important context

Whether supplements suit you together also depends on dose, product formulation, health conditions, and medication use. Ask a doctor or pharmacist first if you take medication, are pregnant or breastfeeding, or have a chronic condition.