Woad Root is a species with an ancient and well-documented history as an indigo dye and medicinal plant. The biological properties of raw material have been known from Traditional Chinese Medicine (TCM). Over recent decades, the modern in vitro and in vivo scientific studies proved anti-inflammatory, anti-tumor, antimicrobial, antiviral, analgesic, and antioxidant activities. The phytochemical composition of I. tinctoria has been thoroughly investigated and the plant was proven to contain many valuable biologically active compounds, including several alkaloids, among which tryptanthrin, indirubin, indolinone, phenolic compounds, and polysaccharides as well as glucosinolates, carotenoids, volatile constituents, and fatty acids.
The whole plant of Woad has shown anti-bactericidal properties and shown its support for the immune system. Woad is used for help with flu, fever, tonsillitis, sore throat, herpes, hepatitis, and skin issues.