na-k-atpase

potassium + magnesium

Magnesium is required for the Na/K-ATPase pump that maintains intracellular potassium, so magnesium deficiency can cause potassium loss that does not correct with potassium alone until magnesium is also replaced. Both minerals independently support healthy blood pressure and cardiac rhythm, though the size of any added benefit from taking them together has not been well studied.