The Liver Tincture of Dr. Schulze s is likely to be enough to let you know if you have parasites - but being a tincture, it goes out into the bloodstream before reaching the lower colon.
One needs (ultimately) a parasite-blend that will saturated the intestinal tract. The raw garlic/cayenne powder combination is very effective. The garlic does go into the bloodstream, so it gets those, too
All parasite cleansing should be done with thorough bowel cleansing....the IF#2 is especially beneficial for die-off issues (because the bentonite/charcoal adsorbs the toxins).