I eat very healthy, mostly organic food, still I tend to run slightly anemic while pregnant. For this reason I take iron, but I take carbonyl iron as it's more easily absorbed. I also take vitamin D3, as I tend to be deficient in this because I live in Minnesota (less of the uvb sunrays here that convert to vitamin D). I also take folate to help prevent birth defects, and krill oil (omega 3's) to help with brain development. In the past prenatal vitamins have always made my nausea worse, but with this pregnancy I have had very minimal morning sickness. I think it's unnecessary to take prenatals unless your diet is really lacking in healthy food. You could also have your doctor check to see if you have any deficiencies...This is simply done by taking a blood sample...That way you will know exactly what you may be lacking in.