Try to eat organic meats if possible. Some people buy from the from the Amish.
Above all avoid liver that is not from organic animals. Liver strains the blood and may be concentrated with Medicines or hormones the animal is fed. Chicken liver may be ok because it is small.
With parasite infection you might have mal-absorption of your food and nutrients. You can try adding enzymes and HCL with your meals digest your foods better.
As we get older our stomach acid gets lower and make it easier to get parasites. Don;t forget the probiotics, yogurt, kifer which is gut friendly and hostile to parasites. Also lots of water with DE.