This is true. I did use the Hulda Clark method to eliminate parasites using Black-Walnut Hull, Wormwood , and Cloves. I also used a zapper. This is recommended, but there are many who have not done a parasite cleanse first and had great results with no problem. I think that the chances of any possible problems are increased a bit if you do not do a parasite cleanse first, but I still feel that it is important not to put off cleaning your liver out.