When your body gets dehydrated, the level of toxins in the body increases, the use of bath salt can be helpful to cleanse the toxins and boost the natural immunity of the body. Your skin needs moisture, bathing in mineral salts helps in keeping the skin hydrated, without making it heavy or sticky in anyway. Sweating often causes the skin to lose its natural minerals, bath salts can be helpful to replenish this loss, making your skin naturally healthy.