I came across this thread because I started searching low iron linked to Covid.

I also was unable to give blood due to low iron levels - which I have never had. I was told they are seeing an increase in this and the day before, app. 8 out of 25 people could not donate because of low iron.

I was just talking to two friends - and one now has anemia (needing infusion)) and one also was unable to donate due to low iron.

Both have had covid and vaccine. I have not had vaccine but have had covid.

So this could all be coincidence, but the increase is concerning.