DARK STOOLS: Ironsupplements cause change in color of the stools from dark to black in most . .Actually according to universaty of maryland it is a desirable side effect, as it means that the if stool does not turn black in color, that means the iron is not getting absorped.This often happens with coated tablets or supplement intended for long term use.If stool does not turn black ask doctor to change brand.
Answered 3/6/2020
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