Iron
I don't like ferrous sulfate because it usually causes horrible constipation. We also absorb carbonyl iron better, but you may absorb the ferrous sulfate well enough.
I'm guessing it has 27 mg elemental iron in it? The ASMBS says menstruating women need 54-63 mg elemental iron a day and everyone else needs 36 mg elemental iron a day. So you'd need two or three of those.
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