A tablet made of sodium bicarbonate (active ingredient) along with citric acid (pH adjustment) creates bicarbonate ions and carbon dioxide (due to sodium bicarbonate). It enhances the warm bath effect and also promotes blood flow throughout the body, stiff shoulders, relieving fatigue, and chilliness. It's a bathing agent which can feel the result. Fragrance free. How you can use: Use two tablets in 180 200L hot water. Recommend you take a bath of at least 15 minutes in warm water around 40 degrees.