im not exactly sure. but this is what i found online...
"Using salt can increase moisture retention, improve circulation, detoxify your skin, helps dry dry skin. Bath salt contains numerous minerals, which helps to restore our body's mineral balance." http://www.squidoo.com/bath-salt
TO BIDDERS/WINNER: i will most likely be in bed when the auction ends. send me a message with your name and address of where i need to ship this item to and i will respond in the morning. i will try to have it shipped out tomorrow(tuesday) or wednesday.