One man's cure is another's poison so take my advice with a grain of salt peter, but I've taken a gob of green Black-Walnut
hull, wormwood and cloves and I have Hep C which damages the liver. But I've never had any problems with liver, kidney or brain damage from taking any herbs.
Personally I think it's a myth and Nature knows what she is doing. You are much safer using herbal remedies than prescription drugs, which undoubtedly cause organ damage, or they wouldn't include a list of contra-indications as long as your arm with the package insert.
I've been deworming regularly around the full moon for years and I sometimes go for a really deep cleanse, which means I take a lot higher dose than is recommended on the bottle. The last time I checked, which was recently, the doctors said my kidneys were really strong.
What makes you think herbs cause this damage you are worried about? Such fear may be overly cautious. Or is there unnecessary paranoia spreading around for some reason? Maybe somebody else knows something I don't.
But organ damage is not something I would worry about at all and blame any of the herbs that are used for cleansing parasites. If anything the opposite is true and they protect your body and prevent what you are worried about, especially if used early enough. On the other hand...
They may stimulate cleansing of parasites out of the organs, which, if left in place, would continue to do some damage. And, if you have a lot of parasites in your brain and they are so big that a dose of wormwood doesn't' kill them, but they wake up and get restless and start moving around trying to find another place to nest in an effort to get away from the poison, you might feel them scrambling around inside of you.
When that happens, it is pretty darn creepy. That is why a lot of people would rather just leave them alone, remain in denial, take pain killers and die. But to me it is even creepier knowing they are in there breeding and laying eggs and all. Other people are very good at denial. They would rather say that it's the wormwood making them hallucinate and it might cause brain damage to continue, than face the fact that they have a worm in their head moving around.
To each his/her own. I'm not going to blame it on the herb while a worm does brain damage to me. It is pretty clear what kind of damage will be done if you leave them in place. They are eating you alive. That is why you feel so terrible. But if you stir them up so much it starts scrambling around, I guess it could scramble your brains. But lets not blame it on the herb that could have prevented all this.
We deworm our cats. We deworm our dogs. We deworm the life stock. We should be deworming ourselves and our children too. And that would prevent this discussion. And I am sure you can get anti-psychotic drugs for thinking so, much easier than you can get enough albendazole to kill a nest of worm and all the hatchlings that will emerge if the mothers die off.