You need bile production to properly fight parasites. Bile can inhibit many parasites and will help with elimination as it stimulates peristalsis. Bile also carries the toxins the liver has to filter. No bile means more poisons trapped in the liver.
Beet juice is great. It thins and stimulates the bile, and provides key ingredients for optimal liver health. coffee enemas increase bile and glutathione production, a key antioxidant for liver health.
Focus on glutathione-rich foods or supplements. Avocado, spinach, cruciferous, watermelon, ALA, SAM-e, NAC, selenium...
Also, activated charcoal will trap most parasite toxins, consequently helping the liver.