Vitamin<unk> 
Normal absorption: 1000 mcg/day PO
Malabsorption: 100-1000 mcg IV/IM or deep SC injection daily for 6 or 7 days
Nasal spray: 500 mcg intranasally in one nostril weekly
Folic acid: 1mg daily
Transfusion rarely needed
Normal absorption: 1000 mcg/day PO
Malabsorption: 100-1000 mcg IV/IM or deep SC injection daily for 6 or 7 days
Nasal spray: 500 mcg intranasally in one nostril weekly
Vitamin B12 deficiency
Hemorrhage
Vitamin B7 deficiency
Hereditary
Vitamin B9 deficiency
Acquired
Vitamin A deficiency
Microangiopathic Hemolytic Anemia 