Onsen spas offer significant benefits due to the unique properties of their volcanic hot spring water, believed in Japan to have healing powers based on its mineral content. The 1,300-year-old Izumo no Kuni Fudoki describes Tamatsukuri Onsen's water as beneficial for skin and overall health. When bathing in an onsen, minerals penetrate the body, balancing the nervous system, and stabilizing bodily functions. Onsen water acts as a potent antioxidant, neutralizing harmful free radicals, preventing cell oxidation, and promoting rejuvenation. This leads to relief from pain, stress, fatigue, and various diseases, earning onsens the nickname "waters of youth."