It depends on your situation. Do you have a fatty liver? Pain in your side? Gall stones? If so, flush your liver before and after the parasite cleanse. If no gall stones or pain in your side, after is plenty. Some people eat nothing but foods parasites hate while they are doing the cleanse. Other eat things the love, to bait them into the stomach. I've tried both. Baiting seems to have some merit if you have elminated all but a few of them, and they have scattered to remote areas of the body.
Humaworm may have a specific protocol he wants you to follow while you are taking his products. Have you checked his forum for information?