Cramp bark is a shrubby plant that is native to Europe and North
America, as well as northern portions of Asia and Africa. Depending on
location, the plant is known by various other names, including Guelder
Rose, Snow Bush and High Bush Cranberry.
The bark has a long history of use in by various Native American tribes,
most notably the Meskwaki and the Penobscot. As the name suggests, cramp
bark is traditionally used to address cramping and muscle fatigue, the
efficacy of which is due to the presence of a type of coumarin called
scopoletin.
