Does cranberry juice cause dark stool?

No scientific evidence suggests that cranberry juice causes dark stools. Cranberry juice contains compounds called anthocyanins and proanthocyanidins, which are responsible for its red color. Anthocyanins can change color in the presence of certain substances, such as stomach acids, but they do not typically cause dark stools. Dark stools are usually a sign of digested blood or certain medications. If you are experiencing dark stools, it is recommended to consult with a healthcare professional to determine the cause.