The drug my doctor prescribed contains "iron iii hydroxide poly-maltose complex and folic acid -"100 mg elementary iron" but I heard it might cause constipation which I have been suffering. I was wondering if I can use dietary supplement instead. I know a brand that have iron supplement which is labeled "Gentle Iron (iron bisglycinate) 25 mg non-constipating" ..so I also don't know how many pill should I take if I use the supplement if I can..