This four-arm randomized controlled trial was designed to study the effects of magnesium
supplements (total daily dose: 450 mg elemental magnesium) on vascular stiffness in healthy
overweight and slightly obese men and women. In addition, the effects of magnesium
supplements on blood pressure and gut microbiota will be evaluated. Three groups will receive
magnesium supplements (magnesium oxide, magnesium citrate or magnesium sulphate) and one
group will receive a placebo.