It seems that simply submerging this product in your home bath will turn it into a radium hot spring. This came out of the closet at my parents' house. It's unused. The box has age-related damage, and the wrapping paper has stains. 〈Medicinal Radium Hope - Efficacy〉 Quasi-drug (47D) No. 447 Rheumatism, neuralgia, hemorrhoids, sensitivity to cold, lower back pain, fatigue recovery, bruises, eczema, stiff shoulders, hemorrhoids