Washing your hair with cypress leaves usually does nothing.
Cypress leaves are the branches and leaves of the cypress plant, Cypressaceae, and can be used as a traditional Chinese medicine with a bitter, astringent flavor and a flat nature, which has the effect of cooling the blood, stopping bleeding, and astringing the sores and muscles (to help the sores heal more quickly and promote the growth of new flesh). It can be used for conditions such as vomiting blood, bloody diarrhea, hemorrhoids, mange, burns, cuts, and poisonous snake bites. Therefore cypress leaves are usually not useful for washing hair.
Cypress leaves can be crushed, ground externally, can also be decocted soup to take, there is no authoritative information to show the contraindications and adverse reactions, the general population can be taken, but as a drug to be taken under the guidance of a doctor.