I use verm x for my goats and sheep. Although do use "proper" wormers too. A friend uses the horse one, and says her worm count is very low, when she uses the test. But, we have had problems with my two older goats, and a worm burden. my vet said he did not think verm x works, and I should use one of the other wormer all the time.
Like you, I prefer to use a natural product if at all possible, so I am a bit on the fence so to speak, as to what to do re the verm x.