Humaworm also contains plenty of black walnut. Some of the herbs in it act as laxatives, so the side effects of taking this even short term may be annoying. Longer term there might be some concern about toxicity of some of these herbs. It might be very useful to take short term for those who have trouble getting rid of parasites. Grapefruit seed extract is also antiparasitic. I suggest that you start using that first, then perhaps try using Humaworm short term if you feel you really need it.