Billy No Mates - herbal flea & tick prevention

Has anyone used Billy No Mates - flea & tick prevention herbal powder? If so is it any good?

I have used Advocate on my westie puppy but this makes his skin very sore. I have changed his wormer to Panacur and am now looking for a flea/tick treatment which I do not have to spot onto his skin.

I have been reading about Billy No Mates & it seems to have good reviews but wondered if anyone on this forum actually uses it and if it does work.

Any other natural or non-spot-on flea/tick treatments suggestions would be welcome.

Many thanks in advance for any suggestions.