Blackmores Pregnancy Iron has been developed specifically for pregnant women containing iron as the only active ingredient. May assist in the management of dietary iron deficiency. Gentle on the digestive system – a low constipation, low nausea form of bioavailable iron when taken with food. Blackmores Pregnancy Iron has been formulated with iron bisglycinate a low constipation, low nausea form of iron that is well tolerated and gentle on the digestive system. Blackmores is Australia’s most trusted vitamin and supplement brand as voted by Australians in the 2009-2017 Readers Digest Most Trusted Survey.