Its too soon to tell if any perm. progress is happening, so far I think my FBO is improved. I found supplements of Zeolite in pill form that were given as gifts to my parents.
Looked online to see what they do, which is to get rid of mercury from the body in a safe way. Took 5 pills and thought nothing of it. Had a bowel movement and released parasites, not uncommon for me in the past few months. Where I noticed a improvement is the smell of my underarms and hair. Before there was an odour in my underarms like piss (my friends commented how they can smell cat piss) , and my hair had a noticeable smell. Been like that for a long time and suddenly it is all gone. I do remember eating a lot of fish oil before getting FBO, one time even taking 2-3 at a time..
I can't tell for certain that my FBO is only from my armpits and hair as It is undetectable by my nose. My bowel movements have been small and in tiny pieces despite eating fruits and veg. and nearly no meat.. Still have stomach gurgling so there are still things that need improvement.
If you can't smell your FBO you may have mercury poisoning like I suspect I do and the smell is garbage/ corridor piss. The comments I get are it smells like shit or whats that smell don't necessary mean an odour of feces (thought that FBO originated from rectum) and is a figure of speech. I never hear who farted or who shit there pants.
So if you are looking into odour emanating from the rectum it may be elsewhere. Although I can't smell it my self I have limited by search only to the rectum as I had a hemmeroid relatively close to the time I gotten FBO. It still is a possibility however..