herbs are toxic too. for example thujone from Wormwood is believed to be the reason that absinthe caused brain damage to many folks before being banned. btw, i see that now that many hipsters want to indulge in absinthe again, lol.
ask yourself, if an herb is antiviral, antifungal, Antibiotic (anti-life), etc etc - what is it doing to your cells as well? so pick your poison.
conventional anthelmintics have worked better for me than herbs so far although i dont rule out using herbs in the future. dont limit yourself to one school of thought. try for yourself and see what works for you.