I was iron deficient when I got the vaccine.It's because I am recovering from anemia after being diagnosed with celiac disease but my levels were climbing.I didn't know about needing optimal iron levels for the vaccine and no one told me either.My ferratin,hemoglobin and iron have all dropped even lower than they were when I was diagnosed over 3 years ago! I am trying to see a doctor to get an iron shot.Supplements will take forever and I am sick of being tired! I sure hope this will be the end of the anemia!