Is Radix Isatidis a Chinese patent medicine for warming and nourishing?

Isatis indigotica, also known as "big blue root"

Processing, cleaning, moistening, slicing and drying.

Bitter nature and cold nature.

① Materia Medica: bitter, cold and non-toxic.

② Classification of Medicinal Materials: Cool.

Meridian tropism: blood enters the liver and stomach.

Function: clearing away heat and toxic materials and cooling blood.

Many ancient books show that Radix Isatidis is cold, even cold. How can it be warm?

Speaking of tonic, it is even more impossible. Its main function is to clear away heat and toxic materials.

Traditional Chinese medicine generally uses it to treat wind-heat colds. Western medicine now uses it to treat influenza, meningitis, Japanese encephalitis, pneumonia, erysipelas, spots caused by heat toxin, dizziness, vomiting, sore throat, parotitis, conjunctival congestion, rash, purple tongue, laryngitis, sore throat, big head plague and carbuncle. Can be used for preventing and treating febrile diseases such as Japanese encephalitis, acute and chronic hepatitis, and mumps.