Chocolate coated tablets sound great to me!  Cascara is a species of buckthorn plant native to western North America from southern British Columbia south to central California, and eastward to northwestern Montana. The dried bark of cascara has been used for centuries as a laxative. The use of Cascara Sagrada as a laxative lasted until May 2002, when the FDA banned its use. The tablets below were made by The Upjohn Company from 1900 to 1929. For being at least 87 years old, that chocolate coating is in good shape.