Yes, your supplements could indeed be causing this. Zincovit (a multivitamin) and folic acid are very frequently prescribed alongside iron, or some multivitamin formulations themselves contain minerals like iron that commonly turn stools a dark green or black color. This is a harmless and very common side effect. However, if you experience other symptoms like stomach pain, dizziness, or if your stools are sticky and foul-smelling, please contact your doctor to rule out any other causes. Otherwise, this is likely a safe reaction to your daily supplements.
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Could taking Zincovit, folic acid, D3 Must 60K, and Softovav be causing my black stools?