Daily vs. Every Other Day Oral Iron Supplementation in Patients With Absolute Iron Deficiency Anemia

Inclusion Criteria: * Age ≥ 16 years; * Outpatients with iron deficiency anemia defined as Hb less than 120 g/L in women or 130g/L in men; AND ferritin less than 30 mcg/L Exclusion Criteria: * • Pregnancy * Currently breastfeeding * Known history of inflammatory bowel disease * Known history of celiac disease * Known history of thalassemia or thalassemia trait * Known inherited bleeding disorder * Known intolerance or lack of response to oral ferrous gluconate, sulfate or fumarate in the last 12 weeks * Multivitamin and mineral supplements (35 mg or more of elemental iron per day) in the 2 weeks prior to randomization * Allergy to oral iron * Allergy to any of the following medicinal and non-medicinal ingredients in ferrous sulfate: ferrous sulphate, calcium citrate, crospovidone, FD\&C Red #40-Aluminum lake, FD\&C Yellow #6-Aluminum Lake, magnesium stearate, microcrystalline cellulose, polyethylene glycol, polyvinyl alcohol, purified water, talc titanium dioxide * Allergy to any of the following medicinal and non-medicinal ingredients in vitamin C: Ascorbic acid, Colloidal silicon dioxide, croscarmellose sodium, magnesium stearate, microcrystalline cellulose and stearic acid * Intravenous iron therapy in the past 12 weeks * On anticoagulant therapy (e.g. warfarin, apixaban, dabigatran, edoxaban, rivaroxaban) initiated in the past 6 months * Surgery planned in upcoming 12 weeks * Chemotherapy planned in upcoming 12 weeks * Blood donation plan…