First let me say that I'm glad I'm not alone. I am a very healthy 43 year old female. I am having the same issue. I have had the COVID vaccine and booster. I know have iron deficiency. It started with thinking I had a pulmonary issue since I could barely breathe on my runs (before this I was running and at OTF). It was actually that I had almost no iron. I have never had a health issue in my life. My past CBCs are rock solid. Since finding this out, I have had a colonoscopy, endoscopy, capsule endoscopy, pelvic ultrasound, CT of my abdomen, chest and thorax. I have also had about 10-12 blood tests, urine tests, stool tests, and tested for H Pylori. Everything is perfect, but my iron is dropping 3 mg/dl a day. I get Infed injections which leave a horrible bruise for months. I can hold iron to save my life! Seems suspect that it was the vaccination.