This product, with its slow release delivery system, gives you the high potency iron you need with the gentleness you want. Gentle to your system: May reduce constipation and abdominal discomfort associated with immediate release iron tablets. Slow release: Time release controlled delivery system gently provides high potency iron. Small tablet: Once a day dosage, easy to swallow. This product is an iron supplement for iron deficiency and iron deficiency anemia* when the need for such supplementation has been determined by a physician. Gluten free. *Iron deficiency is most common among women (approximately 12% of U.S. women).