Yep. Mummy powder. It went on for about 6 centuries in Europe, until science finally got to the point in the 1800's that people stopped believing it was medicinal. It got so bad that it spurred a renewed robbing of tombs in Egypt and elsewhere and eventually counterfeiter started using more recent corpses from cemeteries dried up and ground. Fun stuff. Right up there with painting their faces with white paint which was highly toxic because it was made from lead and vinegar, actually called lead white.