www.jnutra.com/neuro-antitox-ii-cnspns/ lists the ingredients
If it were me? Well, I would do them in separate shot glasses. For no other reason than I am weird.
I would put the Buhner in a glass and add some water and chug it. Then do the same with the Jernigans. I have no reason for doing it this way. It is how I did Beyond Balance and Buhner herbs at the same time.
I don't think the ingredients combined will cause any problem for you or for the working of the herbs.