Loose stools with black bits

[matthewmate]

Hello,
I have so often Loose stools with black bits. I tested blood in stool and parasites with negative result. Also blood morphology and CRP level is OK. Any ideas what it could be?

[TheLightSeeker]

In the absence of other symptoms, it likely has to do with either certain foods you consumed (bananas, rare or raw meat, spinach, beets, wine, plums, black licorice, etc.
or due to the intake of NSAIDs, pepto bismol or other meds and supplements, some of which lead to the die-off certain microbes and some other ones may contain iron, vanadium etc.

best wishes,
Niko