Dan shen is a kind of sage with very red roots. It is commonly regarded as a blood moving herb, i.e., one used to improve circulation as well as the condition of the arteries and overall physiological functioning. Unlike most such herbs, it is not contraindicated for use by persons already taking anticoagulants though careful monitoring is, of course, advised, especially by Asian patients. Dan shen can also be used following traumatic injury, surgery, or any kind of blood loss.