Ingredients(?), but.: The viminta website lists a number of products with varying ingredients--you haven't specified what is contained in your supplement. The timing of dark stool with your start of viminta use certainly is consistent with a cause & effect relationship. However, black stools are an ominous sign of GI bleeding (among other concerns) so if there is any doubt, or you have symptoms, get checked out now.
Answered 6/10/2014
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