As Shas eluded to, what about crushing up a few of these for adding iron to your system?
It's approved for human consumption, in a form that people can absorb so it seems plants could too.

•65 mg
•No artificial flavors, no preservatives
•No yeast, starch or gluten
•Formulated for easy absorption
•Equivalent to 325mg ferrous sulfate

Ingredients
Ferrous Sulfate, Cellulose Gel, Dibasic Calcium Phosphate, Croscarmellose Sodium, Hydroxypropyl Methylcellulose, Titanium Dioxide [Artificial Color], Magnesium Stearate, Polyethylene Glycol, Triethyl Citrate, Polysorbate 80, Sodium Citrate.