I'm not an expert in this, but I believe they can be very helpful.
Of course, they are by no means, magical potions that can cure horse behavioral problems.
But they can definitely be very calming and pleasant to the horse.
I've started researching herbs that are good for my horse, he loves the smell of most of the herbal oils. I am interested in what other people on this forum have to say, as well.
"A horse is the projection of peoples' dreams about themselves - strong, powerful, beautiful - and it has the capability of giving us escape from our mundane existence."