The evidence is wind-heat cold patients drink blue root is useful, but the use of Chinese medicine blue root water alone is limited.
The root is the dried root of woad, a cruciferous plant. It is bitter in flavor and cold in nature. It belongs to the heart and stomach meridian. It can clear away heat and detoxify, cool the blood and benefit the pharynx. It can be used for warm epidemic, fever and sore throat, warm poisonous spots (warm poisonous evil invading the human body leading to skin spots and patches), mumps (equivalent to epidemic mumps), dengue (acute infectious disease, visible skin red like paint), carbuncle, etc. It is often used in conjunction with honeysuckle, and is also used to remove toxins from the blood.
Clinically, it is often used in combination with honeysuckle and jingdianthus for external wind-heat, the beginning of warm disease, fever and sore throat; with xuan shen and horse burdock for wind-heat attacking upward, sore throat; with shengdi and scutellaria baicalensis for warm disease, with reddish and purple dark tongue.
It is recommended that patients use the medication under the guidance of a doctor, do not take the medication on your own, so as not to delay the condition.