Side Effects of Iron Supplements During Pregnancy: How to Avoid Them Iron supplements are vital during pregnancy, but taking them the wrong way can trigger nausea, constipation, and other hidden side effects. Discover expert tips by Trimacare to prevent discomfort, boost absorption, and keep you and your baby healthy — without the unpleasant surprises. For more relevant information, have a look at this blog: https://www.trimacare.com/blogs/news/side-effects-of-iron-supplements-during-pregnancy-how-to-avoid-them