To provide a drinking water that can sustain the efficacy of ingested medicines by using deuterium (D) to reduce active oxygen and the like in the body to maintain health.SOLUTION: In a drinking water, deuterium components obtained by concentrating and separating from natural water are contained as heavy water (DO) and deuterium sulfuric acid (DSO)； the heavy water (DO) is contained by 0 vol.% to 0.4 vol.% and the deuterated sulfuric acid (DSO) is contained by 0 vol.% to 0.4 vol.%； and a total of 0.0001 vol.% to 0.4 vol.% of these compounds are contained in the natural water.SELECTED DRAWING: None【課題】重水素（Ｄ2）を用いて、体内の活性酸素等を還元させて健康を維持し、摂取した医薬の効能を持続させることの可能な飲料水を提供する。【解決手段】 天然水から濃縮、分離して得た重水素成分を、重水（Ｄ2Ｏ）及び重水素硫酸（Ｄ2ＳＯ4）として含有し、重水（Ｄ2Ｏ）を０体積％～０．４体積％含有し、重水素硫酸（Ｄ2ＳＯ4）を０体積％～０．４体積％含有し、これら化合物全体で天然水に０．０００１体積％～０．４体積％含有した。【選択図】なし
