Decades of published research support screening for iron deficiency in female athletes. Here are some of the key findings:
Iron supplementation improves endurance performance even in women who are iron-depleted but not yet anemic — proving that you don't need to be severely ill to be harmed by low iron.
Brownlie et al., American Journal of Clinical Nutrition, 2004
Iron-depleted female collegiate rowers showed measurably impaired performance at the start of their training season compared to iron-sufficient teammates.
DellaValle & Haas, Int'l J of Sport Nutrition and Exercise Metabolism, 2011
The International Olympic Committee recognizes iron status as a key health parameter that should be monitored in athletes at risk of Relative Energy Deficiency in Sport (RED-S).
IOC Consensus Statement, British Journal of Sports Medicine, 2018
Exercise triggers increases in hepcidin — a hormone that blocks iron absorption — for hours after training, making it harder for athletes to maintain iron stores through diet alone.
Sim et al., European Journal of Applied Physiology, 2019
Most adolescent girls fail to meet the recommended 15 mg/day of dietary iron — a target that increases during puberty precisely when many girls begin restricting their diets.
NIH Office of Dietary Supplements — Iron Fact Sheet for Health Professionals