What is a toxic substance? if you absorb anything and it stays in your body, you have been poisoned!
Is wormwood poison? Most will say no, I have noticed most don't even use the real wormwood. I was schocked to see in Dr. Clark's latest HIV/AIDS book a picture of wormwood, it sure isn't the wormwood a herbalist grows to kill parasites. I don't think I have seen a picture of wormwood yet on the web that was the right wormwood! The wormwood they show is the flower type of wormwood and the least effective of all the wormwoods.
Then you have to figure they are using a dead dry herb that has been commercially dried (heated), so it has lost 85% of its deworming value. this why you have so many poor dewormers on the market and why Dr. Clark says MAKE YOUR OWN!
I tell people all the time to make their own and I get 1 person ayear that does, the rest would rathure buy it.
I would have to guess that accumulated toxins known as acid accumulations are your problems and they are removed by your new red blood cells and proper eating habits. you can use herbs if you know herbs and you have doubts and that is always a sign that herbs are not for you. Read herbal books, try Christopher's books and maybe later decide if you want to self-experiment with herbs.
If you want to play it very safe, just read my first school book, the MD, the best this nation ever knew, uses no herbs and no drugs and instructs the cure that improves your red blood cells 5x in 14 days. It works for all and can be done by all that do as instructed. You may feel ill doing htis method also and it can only be from your own waste in your tissues, not from some herb or medicine.