Originally Posted by
Hokulele
I thought you originally stated that you took vitamins as well. Most multi-vitamins do contain a fair amount of iron.
In addition to iron supplements and bismuth(pepto-bismol), black tarry stools can result from bleeding in the GI tract, as in bleeding peptic ulcers. This can be life threatening, and if you experienced this while fasting for many days it should be investigated by a physician.
Without intake of bulky material by mouth there is no reason why the colon should produce black tar like stools, or any stool at all for tgat matter. The body does not excrete "toxins" with enough bulk to form stool into the colon. There are electrolyte secretions into the Colon, and prolonged diarrhea for instance can result in electrolyte imbalances, but not stool formation. Fasting for as little as 2 days in a healthy person should completely empty the colon.