Epsom salt baths have been used for hundreds of years to soothe and restore sore muscles. The magnesium this salt contains is known to have many important roles in the human body, including maintenance of muscles, nerves and the heart. However, there is no definitive scientific evidence to show that we can absorb significant amounts of magnesium through our skin. Are Epsom salts just giving us a placebo effect then, or is the scientific research simply lacking?