The thing that really really screws people up with the fecal Body Odor is that everyone (and i do mean everyone) is different. One can get relief from the Body Odor by one thing, which most others will never get relief from.
I remember trying niacin because there was someone who indicated that it is the one - in - all solution. Obviously that did not work. Next came probiotics overdose. The list goes on.
The only SURE thing that definitely works to a certain extent (whether it be completely or partially) is diet. But even diet is tricky. There may be foodstuff that is a trigger to one, but not to the rest.
Practice exclusion of specific foods. One's trigger can be another's bet source of food.