Si ka duwan daawooyinka caadiga ah ee doonaya in ay go'doomiyaan molecules, dhirtu waxay ka dhigan tahay qaybo ka mid ah walxaha ka shaqeeya isku-dhafka, waana sida saxda ah ee lagu daro walxaha asalka u ah hantidooda badan. Artichoke (cynara scolymuswaa tusaalaha ugu qadiimiga ah ee leh ururka 4 molecules (qaarna, xumaan, succinic et cynaropicrine) kuwaas oo, gooni-gooni loo qaato, aan aad u firfircoonayn, laakiin isku-duubnidooda ayaa saameyn xoog leh oo dawooyin ah ku leh beerka iyo shaqada biliary.

Waxaan aad ugu fogaan karnaa inaan niraahno dhirta ayaa loo sameeyay inay na bogsiiso maadaama unugyaraha dhirta qaarkood ay xiriir dabiici ah la leeyihiin soo-qabayaasha unugyadeena. Tusaale ahaan, morphine laga bilaabo poppy (papaver somniferum) ku xidhan waxa loo yaqaan morphine reseptors ee habdhiska dhexe ee neerfayaasha. Maaddooyinka firfircoon ee valerian (valerian officinalisiyo passionflower (passionflower jir) lagu daro reseptors-ka maskaxda ee benzodiazepines, molecules tranquilizer. Dareenkan, marka si fiican loo isticmaalo oo la waafajiyo baahideena, dhirtu waxay u taagan tahay dawooyinka dhabta ah.