Actually, herbs can be quite strong, when dosed properly. I have seen bottle jaw and coccidia cured herbally. I haven't had bottle jaw here, but I treated a very bad and sudden case of cocci. 1 hour and the herbs had it cleared. It's all about where do you get the herbs (get them from a good source, I strongly recommend Fir Meadow since she has a master degree in herbology) and how do you dose them. Herbs go through the system fast. For the cocci case I gave triple his normal dose every 15 minutes. At the end of the hour he was acting wonderful, and back to normal pellets.With herbal, they work to slow, if a goat has a heavy worm load already. It is wise to use a strong wormer, in those situations.
Herbal isn't always full proof.