I had extremely low iron after giving birth to my daughter, and even after a blood transfusion of four pints I was still really dangerously low. They put me on tablets. My sister in law is a nurse, and she told me the infusions are excruciating injections (don’t know why.) I just took the tablets for a while. They do give you black poo, and a bit of constipation, but it’s worth it. Good luck with whichever you have xx