After a brief account on the role of magnesium in the organism, the article deals with magnesium in mineral waters and its effect when administered by the oral route. The authors discuss in detail Magnesia, the exceptional natural weakly mineralized magnesium hydrogen carbonate mineral water from Louka near Mariánské Lázně. Based on extensive experimental and clinical trials, they explain its importance in the prevention and treatment of magnesium depletion and findings pertaining to its effect in the prevention and treatment of oxalate lithiasis.

        Key words: magnesium mineral water, magnesium in the organism, Magnesia, mineral water drinking therapy, prevention of magnesium depletion, treatment of oxalate lithiasis