Treating Parasites Below are some commonly used treatments for parasites. Angelica (A. archangelica and A. sinensis) Along with Echinacea purpurea, are widely used herbs for the treatment of the protozoa, Trichomonas. Angelica contains coumarin compounds that have been effective against this organism, as well as other worms and parasites. The American and European species are two commonly used species of Angelica. A. archangelica, along with the Chinese variety, A. sinensis or dong quai, is also reported to be superior as a treatment for all ailments of the female reproductive syste ...   read more