Self heal is commonly used for sore throats and halitosis. It is one of the main ingredients of popular commercial Chinese herbal tea, like that of Wang Lao Ji (Chinese: 王老吉; in Cantonese: Wong Lo Kat). The plant's chemical constituents include betulinic acid, D-camphor, D-fenchone, cyanidin, delphinidin, hyperoside, manganese, lauric acid, oleanolic acid, rosmarinic acid, myristic acid, rutin, linoleic acid, ursolic acid, beta-sitosterol, lupeol, and tannins. "Prunella" is derived from 'Brunella', a word which is itself a derivative, taken from ""die Bräune"", the German name for quinsy (a type of throat inflammation), which it was historically used to cure. "Vulgaris" means 'usual', 'common', or 'vulgar'.