HCL is an activator. It is used the same as citric acid. HCL is the same as your stomach acid and that is why it is easier to the body. Plus no harsh taste! Always a big plus! CLO2 gave you the link to purchase some in his message just above your post. Vomiting is not a good thing. If he is vomiting definitely back off! I suspect the body will dispose of the tumor the way it disposes any trash out of the body.
MMS2 is Pool Shock. You need to read up on it. I am not aware of it being in tablet form. You do not want to be tasting the stuff. I put it into empty capsules. Just start with a grain or 2 at a time followed by a full glass of water. If all goes well next time add another grain or two. Go slowly. No need for additional discomfort in my opinion.
Here is a link that CLO2 posted that shows what is needed for pool shock. Scroll down as he posted a photo.
g2cforum.org/index.php/list/search?query=pool%20shock&searchdate=all&childforums=1&ids=&limit=5
Can't help about the drug but usually from what I hear there is not a problem. It is something you have to find out for yourself and see how it works.