Hulda Clark mentions putting Black-Walnut in the flush ingredients too--so when I got a bottle of organic neem oil, I had it sitting on the counter, and at the last minute decided to put some drops of it in the flush ingredients--and the entire flush was parasite stuff. I then did another flush the following night to get the stones cleaned out.
Neem oil--is nasty, (but effective). I put it in capsules.
Oregano oil is strong stuff! 3 drops would be alot for it. I can see why it would kill parasites in with the flush ingredients. It's also a natural antibiotic, and would most likely kill fungus (candida) too. But, a little bit- goes a long ways.