Mineral waters with exceptionally high total dissolved solids (TDS) and dense concentrations of calcium, magnesium, and sulfates include European heavyweights such as Hépar and Saint-Yorre (France), Gerolsteiner (Germany), and specialized mineral-rich brands like Donat Mg. These mineral waters feature powerful taste profiles that can taste salty, chalky, or metallic, and are often consumed for specific dietary mineral supplementation.