Isatis tinctoria seeds

Bitter in flavor, cold in nature, it is related to the heart, liver and stomach channels.
 

Clears away heat to expel toxic substances, removes heat from the blood and soothes the throat.

For treating febrile diseases such as fever, headache and sore throat as well as a variety of ailments due to exuberant toxic heat, such as maculae (a stain, spot or thickening of the skin) caused by intense toxic heat, mumps, skin and external diseases, erysipelas (an acute febrile disease associated with intense local inflammation of the skin) and infection with swollen head:

Use it with honeysuckle Flower (Flos Lonicerae), weeping forsythia fruit (Fructus Forsythiae), great burdock achene (Fructus Arctii), etc., e.g., Puji Xiaodu Yin.

Isatis root may have preventive and therapeutic functions on Severe Acute Respiratory Syndrome (SARS) or atypical pneumonia.