My bowel movements have a metallic smell. should i be concerned?

Taking iron pills?: The amount, color, frequency of stool varies with foods, speed of emptying of the GI tract, medications ; supplements ingested, gut flora (unique for each individual), additives (like blood), subtractions (like absent bile), infection, inflammation, ; other factors. If stool pattern has changed, is unusual for you, ; the change persists, or is accompanied by other symptoms, see your doctor.