Prunella vulgaris is bitter in taste and cold in nature. It enters the lung meridian and has the functions of clearing the lungs and relieving cough, promoting bile and reducing jaundice, cooling the liver and calming wind, and softening and dispersing stagnation. It is a very useful medicinal material. Prunella vulgaris is well-known for its functions of relieving cough and reducing phlegm, clearing away heat and cooling blood, reducing swelling and detoxifying. It can also treat many diseases such as dysentery, sore throat, tuberculosis, etc., and has extremely high medicinal value. Prunella vulgaris contains flavonoids, which can stimulate the respiratory mucosa to increase secretion, and can also reduce the permeability of capillaries, thereby reducing the permeability of inflamed tracheal mucosa and blood vessels, thus reducing exudation and playing an anti-inflammatory role. Prunella vulgaris can also act on the smooth muscles of the trachea to relax the trachea and relieve asthma. Moreover, the acidic ethanol extract and flavonoids contained in Prunella vulgaris can increase the total number of white blood cells in peripheral blood and have a strong anti-infectious effect in the body. In addition, Prunella vulgaris also has certain antihypertensive and central nervous system stabilizing effects.

However, it is mentioned in the book "A New Materia Medica" that Prunella vulgaris is slightly poisonous, so we must eat it in moderation and not use it in large amounts for a long time. Moreover, Prunella vulgaris is cold in nature, and excessive use can easily harm the body, especially women. Many women have a cold constitution. When winter comes, their hands and feet will be cold and they will be very afraid of the cold. Women need to eat more warm and tonic foods frequently and avoid raw and cold foods, so women are not suitable to eat too much Prunella vulgaris.