Folic Acid During Pregnancy: Why It Matters & How Much You Need

Folic Acid: The Small Vitamin with a Big Job

If you’ve started reading up on pregnancy nutrition, chances are folic acid was one of the first things you came across. It tends to top every list, and for good reason. Folic acid is the synthetic form of folate, a B vitamin (B9) that your body relies on to build new cells. During pregnancy, your body is building new cells at a remarkable rate: blood cells, brain cells, skin, hair and nails all need folate to develop properly.

The word “folate” traces back to the Latin folium, meaning leaf, a nod to the fact that it occurs naturally in dark, leafy greens. Folic acid is simply the lab-made version used in supplements and fortified foods, valued because it’s more stable and consistently absorbed than folate from food alone.

Why the First Few Weeks Matter So Much

Here’s the part that catches a lot of people by surprise: folic acid does its most important work before most women even know they’re pregnant.

In the earliest weeks after conception, your baby’s neural tube is forming. This is the structure that eventually becomes the brain and spinal cord. By around one month after conception, the tube needs to close properly. When there isn’t enough folic acid on hand, that closure can be incomplete, leading to what’s known as a neural tube defect (NTD). Two of the more recognised types are spina bifida, where part of the spinal cord develops outside the body, and anencephaly, where the brain and skull don’t form completely.

This is exactly why taking folic acid before pregnancy matters so much, rather than starting only after a positive test. By the time most women find out they’re expecting, the neural tube has often already finished forming. Folic acid is currently the only form of folate shown to help lower NTD risk, which is worth keeping in mind if you’re ever comparing supplement labels.

So, How Much Folic Acid Do You Actually Need?

For most women trying to conceive, the standard guidance, consistent with health authorities in Singapore and internationally, is 400 micrograms (mcg) of folic acid daily. It’s best to start one to three months before conception and continue through the first trimester. Since roughly half of all pregnancies are unplanned, some doctors suggest treating this daily folic acid dosage as an everyday baseline rather than something to start only once you’re actively trying.

If you’ve previously had a pregnancy affected by a neural tube defect, your risk for a future pregnancy is higher, and your doctor may recommend a substantially higher dose, typically 4,000 to 5,000 mcg (4–5 mg) daily. This higher dose should also start around a month before conception and continue through the first trimester. Because it’s a large step up from the standard amount, it should only be taken under a doctor’s guidance rather than self-prescribed.

Note: Every woman’s health background is different, and certain medical conditions or medications can change what’s appropriate for you. Your doctor is the best person to confirm the right dose for your situation.

Getting Enough: Supplements, Fortified Foods, and Real Food

In practice, it’s difficult to reach your daily folic acid target through diet alone, which is why supplementation is so commonly recommended. A daily multivitamin or a dedicated folic acid supplement is usually the simplest and most consistent way to close that gap, and most prenatal vitamins available in Singapore contain 400 to 800 mcg per tablet.

Fortified foods can help too. In many countries, folic acid is added to everyday foods like breakfast cereals, bread and pasta during processing. Checking the label for the words “enriched” or “fortified” will tell you whether it’s included.

And then there’s food in its natural form. Even though it’s hard to meet your full target through diet alone, eating folate-rich foods is still genuinely worthwhile. Think dark leafy greens like spinach and kale, legumes such as beans, peas and lentils, citrus fruits, and eggs.

One detail worth checking on your supplement label: folic acid is currently the only form of folate proven to help prevent NTDs. If a product lists only other forms, such as methylfolate, without folic acid alongside it, it hasn’t been shown to offer the same protective effect. When in doubt, a quick check with your pharmacist or doctor can clear this up.

What About Folic Acid Before IVF?

If you’re preparing for IVF in Singapore, folic acid deserves a place on your checklist well ahead of treatment. The general guidance for women trying to conceive, including through fertility treatment, is 400 mcg of folic acid daily, ideally starting around three months before you begin trying and continuing through the first 12 weeks of pregnancy. It’s often one of the simplest parts of fertility preparation, though it’s easy to overlook.

One exception worth knowing about: some women carry a genetic variant, known as an MTHFR mutation, that makes it harder for the body to convert folic acid into its active, usable form. If this applies to you, your doctor may suggest methylfolate instead, or additional testing to understand what your body needs. This isn’t something to self-diagnose; it’s worth raising directly with your fertility specialist.

Folate’s role here extends beyond the neural tube. It’s also involved in how cells synthesise and divide DNA correctly, a process that matters for egg quality and early embryo development, both of which play into how a fertility treatment journey unfolds.

Quick Recap

Thinking About Your Next Step?

Folic acid is one of the simplest things you can build into your routine while preparing for pregnancy, whether you’re trying naturally or through IVF. If you’d like to talk through your nutritional and health preparation as part of your broader fertility journey, our team at Alpha IVF Singapore is looking forward to have that conversation with you.