Prenatal Vitamins: What You Actually Need and When to Start

Folic acid, iron, DHA, and the rest — a clear breakdown of prenatal supplement essentials, what to look for on labels, and when food alone is not enough.

A balanced diet is the foundation of a healthy pregnancy, but some nutrients are hard to get in sufficient amounts from food alone — especially in the first trimester when nausea may limit intake. A good prenatal vitamin fills those gaps.

Start before conception if you can

Ideally, begin a prenatal with at least 400–800 mcg of folic acid (folate) at least one month before trying to conceive. Folic acid dramatically reduces the risk of neural tube defects like spina bifida, which form in the first 28 days — often before you know you are pregnant.

Non-negotiable nutrients

Look for folic acid/folate, iron (often 27 mg in pregnancy), iodine, calcium, vitamin D, and choline if possible. DHA (an omega-3) supports fetal brain and eye development — 200–300 mg daily is a common target. If your prenatal lacks DHA, a separate fish-oil or algae-based supplement is fine (choose low-mercury sources).

What about gummies?

Gummy prenatals are easier on a queasy stomach but often lack iron. If gummies are all you can tolerate in the first trimester, that is okay short-term — discuss iron supplementation with your provider, especially if bloodwork shows anemia.

Talk to your provider about extras

Do not double up on supplements without guidance. High-dose vitamin A from retinol (not beta-carotene) can be harmful. Your provider may recommend additional iron, vitamin D, or aspirin in specific situations — but more is not automatically better.