My experience with the anti-parasite products, and I've got a lot of it, is: I have yet to see parasites become resistive to any of the bug killers available, I've just never seen it. I've been doing this and teaching this for over 10 years now.
For sure the parasites and their eggs get layered in there but it's very easy to kill them off as they hatch and carry on. As each layer comes off more of the liver comes back on line. Thus you get healthier in stages, not all at once.
The one month bug killer regime usually isn't enough. Clarks orignal time length was three months and I still agree with that as a minimum. Recently I have changed my maitanance program also. After the three months instead of going out to once a week or once every other week I suggest every third day for a good 2-3 more months.
If any eggs are in the liver (or elsewhere) they will hatch after 48 hours of the last shot of bug killer. It takes another 24 hours for them to mature enough to start the whole cycle over again and start laying eggs. So, every three days take a shot or two of bug killer. As the eggs hatch kill the bugs off. Eventually no more bugs at all. Permenently gone.
You'll feel that too. It's almost a surprise. No more bugs. Ahhhh, what a relief.
Barefoots bug killer - DeWormer:
First week 4 times per day. Ten minutes BEFORE breakfast, lunch, and dinner and then before bed.
Weeks two and three: Twice a day - ten minutes before lunch and at bedtime.
After week three do once a day for a good two months. Then every third day for a couple of months or even for a year to make sure ALL bugs and their eggs are gone.
The first 2-3 months through all this flush about every two weeks. Once on maitanance flush when needed.
Limit the antioxidents you're taking. The foggyness and ill feelings are cellular detoxing. Probably a bit too fast. I found Schulzes detox tea good for eliminating that feeling. It forces the garbage out of the blood and lymph into the liver.
Remember, once in a lifetime. Once the bugs are gone, the liver back on line and a bit of healing takes place you'll know. Once you know it's a whole new world. You'll be over the hump into the light.
So as far as I know, and have seen from 10 plus years of experience the parasites die too quickly to build any resistance. I've just never seen parasites develop resistance to any and all bug killers. Clarks, Humaworm, Barefoots, any of them.