Why Most Prenatal Vitamins Cause Nausea (And How to Avoid It)

Taking a prenatal vitamin should make you feel stronger, healthier, and more supported—but for many moms-to-be, it’s a different story. If your prenatal is making you nauseous, bloated, or breaking out, you're not alone. The good news? It doesn’t have to be this way.

Let’s break down why some prenatal vitamins cause nausea and skin issues, plus how to find one that actually works with your body, not against it.

Why Do Prenatal Vitamins Make You Nauseous?

Many women experience nausea, especially in early pregnancy, but the wrong prenatal can make it worse. Here’s why:

Iron Overload – While iron is crucial for red blood cell production, some forms (like ferrous sulfate) are harsh on the stomach and can cause nausea and constipation. Instead, look for iron bisglycinate (Ferrochel®), a gentle, well-absorbed form that won’t upset your digestion.

Synthetic Folic Acid – Some women have difficulty processing synthetic folic acid due to MTHFR gene variations, which can lead to nausea and headaches. Choosing methylfolate instead can help reduce this reaction.

Low-Quality Fillers & Coatings – Many cheap prenatals contain artificial dyes, additives, and coatings that can be hard to digest, contributing to nausea.

Taking It on an Empty Stomach – Some vitamins (especially B-complex, iron, and zinc) can cause nausea when taken without food. Try taking your prenatal with a meal to minimize discomfort.

Not all prenatal vitamins are created equal. If your current prenatal is causing nausea, it’s time to switch to one that’s formulated to work with your body—not against it.

Back to blog

Ready to get fussy with us?