The aqueous solution whose life of dissolved hydrogen is long is offered at inexpensive cost. Above 0.01ppm, at the same time, being the aqueous solution where the hydrogen of the quantity below solubility dissolves, The restoration characteristic aldehyde basis and/or the substance which possesses the glycoside hydroxyl basis being added in the aforementioned aqueous solution, it becomes, content of the said substance is the ratio 10 - 300000ppm.溶存水素の寿命が長い水溶液を低廉なコストで提供する。0.01ppm以上で、かつ、飽和濃度以下の量の水素が溶存した水溶液であって、前記水溶液には還元性のアルデヒド基および/またはグリコシドヒドロキシル基を有する物質が添加されてなり、該物質の含有量は10~300000ppmの割合である。
