The aims of this study were to establish whether a magnesium (Mg) deficit indicated by a decreased urinary excretion exists and to determine whether 12-week oral Mg supplementation affects the Mg status and bronchodilator use in children with stable bronchial asthma. The effects of long-lasting Mg supplementation were investigated in 89 children 4 to 16 years of age with mild or moderate persistent bronchial asthma in a randomized, double-blind, placebo-controlled, prospective study. Each subject received one capsule of Mg citrate per day (= 7 years: 200 mg, > 7 years: 290 mg) or one capsule of placebo containing 260 mg glucose during 12 weeks.
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