Rehmannia glutinosa (Rehmannia Root)

Rehmannia glutinosa, commonly referred to as Rehmannia root or Chinese foxglove, is a perennial herb traditionally used in Chinese medicine. The root is the primary part used and may be processed in either raw (Sheng Di Huang) or prepared (Shu Di Huang) forms, with the latter involving steaming or drying to alter its properties.

In equine feed and supplement formulations, Rehmannia root is sometimes included for its bioactive compounds, such as iridoid glycosides (e.g., catalpol), phenolic acids, and polysaccharides. These constituents are studied for their potential anti-inflammatory, antioxidant, and immunomodulatory effects.