High potency. Once a day. Slow release for fewer GI side effects. Gentle to your system. No. 1 doctor recommended (among OTC iron-only supplements). Easy to swallow. Slow Fe has a controlled delivery system that provides high potency iron while being gentle on your stomach, so you experience fewer GI side effects (nausea and abdominal discomfort) common to iron use. Slow Fe is an iron supplement for iron deficiency and iron deficiency anemia when the need for such therapy has been determined by a physician. Iron deficiency is most common among women (approximately 12% of US women). The 45 mg of elemental iron in each tablet is equivalent to 142 mg of ferrous sulfate. Tablets non-USP (dissolution, assay). Questions? Call 1-800-452-0051.