Regular intense exercise or hard training promotes red blood cell production and it is also thought to increase iron loss through sweat. (womenshealthandfitness.com.au)
GPs now agree, however, that it's perfectly safe to reduce or even stop your period altogether by taking the Pill continuously, which may reduce iron loss as well as putting an end to «nice» and «time of the month underwear», embarrassing leaks during workouts and, horror upon horror, taking tampons out with you on a night out. (womenshealthandfitness.com.au)
I have also been involved in multiple studies of donor reactions and donor iron loss, and am now leading a large NHLBI - funded study (RBC - Omics) investigating genetic and metabolomic mechanisms underlying differing capacity of donors from diverse racial - ethnic groups to tolerate frequent RBC donation and of their donated RBC to maintain functional integrity during storage for 42 days. (bsrisf.org)