I would not purchase a goat from someone who (especially those who do not fecal sample and worm "because") wormed them monthly with chemical wormers, I would not purchase a goat from someone who needed to worm them weekly with herbs. Look up wormwood in any catalog it is an abortive agent.
We basically know the milk withdrawal of most chemical wormers, either from cattle, or from Goat Medicine...we have no idea what the withdrawal time is for herbal wormers, and since each herbal blend is made up by someone, each batch is different, contains differing amounts of whatever the person chooses.
The deaths and loss of production (meat and milk) from worms is always found in those who use herbal wormers on these lists, or they are using chemical wormers incorrectly. We have been doing these lists for a very long time, come spring the deaths from worms starts...herbal wormers, DE or never worming is always the case. 99% of the time from goats in the south.
You can save yourself alot of grief and alot of money, by fecal sampling (10$ at most vets) ask them what worms you have and how many eggs per gram you have,. worm, then run another fecal to see if your wormer is working. Or learn to do this yourself saanendoah.com teaches you how, and you don't need any kind of expensive microscope, even a Toy's R us special with a light source will work. Then you are no longer guessing what works or what doesn't.
Anyone who is in the south with more than a handful of goats who is reading this thread, you are playing with the life of your goats to worm with herbs, DE or soap in the water, without fecal sampling. Worms kill, it's just that simple.
And I would bet that I worm less than most of you with my chemical wormers, which means less money spent, less drug in the goats liver for it to process, a known milk and meat withdrawal...so which one is more natural? Vicki