Iron is not seen as crucial for thyroid function – and biologically available iron is not always possible. Real iron measures are often missed as you need to know the iron stores – not just the hemoglobin blood results. Blood tests often are not for iron storage – hemaglobin levels alone are insufficient information.
When the gut function is not strong, iron may not be absorbed, regardless of what is being ingested or is from pills.
Bioavailabilty.Eat balanced, varied wholefoods.