One that doesn't attack parasites directly but removes their "food." Parasites thrive in filth and waste matter and die out where it is too clean for them. You cannot kill them all, some will survive and be back with a venegance in no time and with re-enforcement. Undigested protein foods are their favourate reeeding grounds. All dead flesh, as in meat, chicken, fish, is naturally infested with parasites. The liver cleanse is a prerequisite for removing these breeding grounds, and so is a diet/lifestyle (see The Key to Health and Rejuvenation) that doesn't constantly recreate them.

Best wishes,
Andreas