Windmill Fe Gluconate Iron Tablets formula provides you with 27 mg of elemental iron from 239 mg of ferrous gluconate per tablet. If you compare the Fe Gluconate Iron formula to the Fergon formula, you will find out that the two formulas are almost identical however, Windmill does not use artificial colors, flavors, or preservatives. Windmill?s promotional pricing will also give you the savings you are looking for. For additional formula information, view the Supplement Facts panel. All Windmill supplements are manufactured in the United States in an FDA-inspected facility whose GMPs (Good Manufacturing Practices) are independently verified by qualified certification organizations.Windmill is a trusted name that has been providing America with quality supplements for over 40 years.