Most parasites are teeny tiny! So, they are for sure dyeing! The big ones, are usually digested after they die. Others poop in a collender of sorts then sift through it to see what they can find. They are dyeing! I did not see anything until after two weeks, and then only every now and then did I see something (I wasn't willing to go digging, I just trusted it was working!). Mostly I saw hair like worms coming out every now and then but not much. My husband had one big one, once...we are doing our second cleanse and we saw a ton on the first and second day, and not much else, but I can already feel heeps better so I know it is working!!