Hello,
Thanks for posting your query.
Usually poly iron 150 mg capsule contain 150 mg of elemental iron whereas other iron containing capsules like ferrous fumarate contain almost half of elemental iron.
Therefore, poly iron 150mg capsule gives good amount of elemental iron as compared to others.
However, a dose 200 to 300 mg elemental iron will lead to absorption of iron up to 50 mg /day.
I hope I have answered your query, feel free to ask further queries if any.
Regards.