Why are these types of salts beneficial? Magnesium is important for both combating stress and fluid retention, slowing skin aging and calming the nervous system. Calcium is effective at preventing water retention, increasing circulation and strengthening bones and nails. Potassium energizes the body, helps to balance skin moisture and is a crucial mineral to replenish following intense exercise. Bromides act to ease muscle stiffness and relax muscles. Sodium is important for the lymphatic fluid balance (this in turn is important for immune system function). So we can see that bathing in high quality sea salt could replenish the minerals which are critical to our skin metabolism.