For the ferrous fumarate the. Iron atom is attached to a molecule of fumaric acid. This makes it easier to absorb. When it is absorbed the iron atom separates. The different number means that 73 mg of iron fumarate will produce 24 mg of iron when that separation happens.
Similarly, 76.88 mg of iron bisglycinate will produce 30 mg of iron.
One of either of those every day will provide all the iron you need without the risk of you having too much (as long as you don’t take other iron-containing supplements).
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