system
A chat on subreddit /r/NoStupidQuestions
human
You absolutely do not need a $100 parasite cleanse from some random woman lol.

That being said, pretty much every living thing is full of billions of harmless microscopic organisms that are or could be called parasites.  

If you wanted a real parasite cleanse you would go to the doctor and they would prescribe you with something if you needed it.
gpt
Just to be clear, parasites do harm to their host.  The micro organisms you mention do no harm, and therefore are not parasites.  Doctors would not prescribe anything to cleanse your body of these microbes.