The effect of magnesium supplementation on blood pressure, erythrocyte cation metabolism, and serum lipids was evaluated in 13 patients with mild hypertension. After randomization and a 3-wk placebo run-in period, seven patients received 40 mmol Mg aspartate (20 mmol elemental Mg twice daily) and six received placebo for 3 mo. In comparison with placebo treatment, magnesium aspartate therapy had no effect on blood pressure, lipid concentrations, or erythrocyte cation metabolism. These results demonstrate that in magnesium-repleted hypertensive subjects, magnesium supplementation does not affect blood pressure or lipids probably because magnesium has no effect on cellular cation metabolism in magnesium-replete individuals.
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