Do osteopaths have anything to do with herbalists?

Usually not but... The osteopathic profession started with the concept that alignment of bones plays a key role in health & treated people with adjustments. Over time osteopaths have become nearly identical to md's & now most don't even do adjustments (though many do & these can be very helpful). Like md's, osteopaths are not trained to use herbs, but the average osteopath is a bit more holistic & some do use herbs.