There are other herbs you can try to see if they will have an effect. You could try grapefruit seed extract, along with male fern, clove, Wormwood , and pumkin seed. I would also suggest reading the ingredients in popular parasite cleanse combos. If they do not contain BWH then try them, if they do, then see if you can find 3 or 4 of the other ingredients and try them separarely at their recommended dosages. Also, do the Bowel Cleanses and Liver Cleanses to help make the GI tract healthier. I have also heard really good things about oregano oil, but I would suggest putting it in capsules as I, personally, can't stand the taste. Of course, you will want to research each herb to be sure they do not react with the thyroid.