Do Iron Supplements Change the Color of Your Poo?
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4 min read
According to a 2021 review, oral iron supplementation is associated with significant gastrointestinal side effects, including a noticeable change in stool color. It is very common and completely normal for people taking iron supplements to observe their stool turning a darker shade, often black or dark green. This change occurs due to unabsorbed iron passing through the digestive system and is not a cause for concern in most cases.