It is reasonable to get a ferritin as that truly looks at iron stores in your body. You can check it while on iron but you should have at least 12 hours pass after your last dose. It can take up to 6 months to replace iron after your blood count is normal. Hopefully you have identified a reason for low iron? Also different things impact absorption of iron. Your version has the most iron in it
Answered 11/6/2021
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