Though advocates of halotherapy point to stories of recovery from respiratory and skin problems, doctors say there's not enough research to back up claims.
It's 1 o'clock on a Tuesday afternoon, and Heidi Kling is reading in an all-white room. She's shoeless, but socks protect her feet from the 6 inches of salt that cake the floor. The only objects in the windowless room are four chaise longues and hand-molded plaster icicles that hang from the ceiling. If there were a Yeti in the room, you would swear you were on the Matterhorn at Disneyland.

