If I were looking for a product to use against parasites
internally & externally, I would probably choose Oregano
Oil. Externally, you need to mix it with a carrier oil.
I use Olive or Sunflower. 1 drop oil to 11 drops oil or
thereabouts. Internally, you would want to use 1 drop in
a veggie cap and work up to a higher dose. Some people just
put a drop in a glass of water and swig it down too.
Grapefruit seed extract is another good option~