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Oral supplementation may improve the dietary intake of magnesium, which has been identified as a shortfall nutrient. We conducted a pilot study to evaluate appropriate methods for assessing responses to the ingestion of oral magnesium supplements, including ionized magnesium in whole blood (iMg 2+ ) concentration, serum total magnesium concentration, and total urinary magnesium content. In a single-blinded crossover study, 17 healthy adults were randomly assigned to consume 300 mg of magnesium from MgCl 2 (ReMag ® , a picosized magnesium formulation) or placebo, while having a low-magnesium breakfast. Blood and urine samples were obtained for the measurement of iMg 2+ , serum total magnesium, and total urine magnesium, during 24 h following the magnesium supplement or placebo dosing. Bioavailability was assessed using area-under-the-curve (AUC) as well as maximum (C max ) and time-to-maximum (T max ) concentration. Depending on normality, data were expressed as the mean ± standard deviation or median (range), and differences between responses to MgCl 2 or placebo were measured using the paired t -test or Wilcoxon signed-rank test. Following MgCl 2 administration versus placebo administration, we observed significantly greater increases in iMg 2+ concentrations (AUC = 1.51 ± 0.96 vs. 0.84 ± 0.82 mg/dL·24h; C max = 1.38 ± 0.13 vs. 1.32 ± 0.07 mg/dL, respectively; both p &lt; 0.05) but not in serum total magnesium (AUC = 27.00 [0, 172.93] vs. 14.55 [0, 91.18] mg/dL·24h; C max = 2.38 [1.97, 4.01] vs. 2.24 [1.98, 4.31] mg/dL) or in urinary magnesium (AUC = 201.74 ± 161.63 vs. 139.30 ± 92.84 mg·24h; C max = 26.12 [12.91, 88.63] vs. 24.38 [13.51, 81.51] mg/dL; p &gt; 0.05). Whole blood iMg 2+ may be a more sensitive measure of acute oral intake of magnesium compared to serum and urinary magnesium and may be preferred for assessing supplement bioavailability.

Circulating Ionized Magnesium as a Measure of Supplement Bioavailability: Results from a Pilot Study for Randomized Clinical Trial