New Roots Herbal Wormwood - Used where there is indigestion, especially when due to a deficient quantity or quality of gastric juice. Wormwood is a powerful remedy for the treatment of parasitic worms, especially roundworm and pinworm. Wormwood is also used to help the body fight fever and infections. Wormwood is known for success for gallbladder inflammation, indigestion, heartburn, irritable bowel syndrome, parasites, as well as poor appetite.