Why are my ferritin levels not increasing?

For the past month I’ve been taking prenatal vitamins (just for the extra vitamins) which have quite a bit of iron in them. I’ve been losing hair for the past two in a half months, so my doctor drew my blood and my iron levels were normal and my ferritin levels were only at a 4, which I’m sure is the cause of my... show more For the past month I’ve been taking prenatal vitamins (just for the extra vitamins) which have quite a bit of iron in them. I’ve been losing hair for the past two in a half months, so my doctor drew my blood and my iron levels were normal and my ferritin levels were only at a 4, which I’m sure is the cause of my hair loss. However, what I dont understand is why the vitamins have not helped to raise it at all. I got my blood drawn about 3 weeks after I started taking the vitamins. I’m losing my mind over this. I’m only 20 years old!
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