посмотрите здесь: железа бисглицинат обладал наилучшей переносимостью во время беременности:
Of the 517 women (84.5%) reported using iron supplements, 453 were eligible for the study. The most common preparation was ferrous fumarate (46.8%, P < 0.01), followed by ferrous sulfate (31.8%), ferric polymaltose (12.4%), and ferric bisglycinate (7.3%). Almost half the participants (45%) reported at least one adverse effect, especially constipation (27.4%, P < 0.01), nausea (10.8%). Multivitamin preparations and ferric bisglycinate were associated with the fewest side effects (23.7, 21.2% respectively, P < 0.01), and ferrous fumarate and immediate-release ferrous sulfate with the most (56.3, 53.7% respectively). Eighty-three women discontinued their originally prescribed iron preparation, mainly (89%) due to side effects. Discontinuation rates were lowest for the multivitamin and ferric bisglycinate (10.5, 9.1%, respectively).
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Arch Gynecol Obstet. 2007 Dec;276(6):601-4.
Iron supplementation in pregnancy--does the preparation matter?
Melamed N...
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