The rosehip is the "fruit" of the rose bush. It contains achenes surrounded by a kind of hair that can cause itching due to its very irritating quality. The decoction, meaning the preparation, consists of being boiled in water, the rosehip is used in tea, and acts against diarrhea and fatigue. Rosehips are rich in vitamins including C, and can be used in the case of deficiency. The bristles are also sometimes eaten mainly for the elimination of a parasitic roundworm; but the hair can irritate the anus.