Fatigued women ( Piper Fatigue Scale [ PFS ] score 5 ) with iron deficiency ( ferritin < 50 g/L and transferrin saturation < 20 % , or ferritin < 15 g/L ) and normal or borderline hemoglobin ( 115 g/L ) were enrolled in 21 sites in Austria , Germany , Sweden and Switzerland , blinded to the study drug and randomized ( computer-generated randomization sequence ) to a single FCM ( 1000 mg iron ) or saline ( placebo ) infusion .