Ferritin is a storage form of iron. If your other iron levels are good, then it is not critical to take a supplement.
Ferritin is comprised of a complex protein peptide that encircles the iron molecules. Some people have a defect in producing this peptide. Also, with heavy periods, may become low in ferritin over time. If you have this defect of non production of the protein part, taking extra iron won't fix that.
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Weezie looking at petunias 8.25.2017
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