Phase 3 was a randomized, placebo-controlled supplementation trial designed to explore how IDNA and iron supplementation affect iron status, performance, and training over 6-weeks of rowing training. Rowers with normal iron status were included in this study to examine training effects (if any) on iron status and performance. This study was designed to elucidate the cause-effect relationship(s) between iron status (and iron supplementation), training and performance.