Thank you everyone for the input! I have been on Tyenne for my infusions. They have done a lot of blood tests and my vitamin B 9 + 12 are okay, as is my WBC, RBC, RDW/SD, reticulites and hemoglobin. They started doing extra testing when they noticed abnormal red blood cell shapes. The amount of ferritin is fine, but the iron saturation is at only 13%. That's why they started me on the iron supplement. I'm only two pills into it, and more blood work is ordered for next week. The impression I'm getting is that they can't figure it out.