An NPR experiment on Kinoki foot pads tested to see if they'd drawn anything out of a reporter's body.
Reporter Sarah Varney and her husband bought some “detoxifying” Kinoki foot pads and wore them to bed. In the morning, they both awoke find the pads covered in the brown mess that the advertisement had promised. But when they took the foot pads to a lab and had them analyzed and compared with unused pads, the used pads were almost identical to the blank.
Further experimentation showed that the “gunk” in the pads shows up if you hold the pad over a pot of boiling water. Who knew steam had "metabolic waste"?
The Consumerist August 19, 2008