Folic acid: the one supplement that isn't optional

Most pregnancy nutrition advice comes with a side of “if you can” and “do your best”. Folic acid is the exception — the one supplement with evidence so strong that it’s recommended, unambiguously, for everyone who’s pregnant or trying to be. Here’s why this little vitamin earned that status, and how to get it right.

What it does. Folate (vitamin B9 — “folic acid” is the supplement form) is essential for making new cells, and no one is making new cells faster than an early embryo. Its starring role is in building the neural tube — the structure that becomes your baby’s brain and spinal cord — which forms and closes in the first four to six weeks of pregnancy. When the tube doesn’t close properly, the result is a neural tube defect such as spina bifida. Folic acid taken around conception dramatically lowers that risk — one of the clearest wins in all of preventive medicine.

Why the timing is the whole point. The neural tube closes before many people even know they’re pregnant. That’s why the advice is to start a supplement at least one month before conception, not at the first positive test — and why, if you’ve just found out you’re pregnant and haven’t been taking it, the right move is simply to start today. No guilt, either: the risk was always small, folate also comes from food, and starting now still helps, because folate keeps supporting your baby’s growth all through pregnancy.

How much. The standard pregnancy dose — the amount in any supplement or multivitamin labelled for pregnancy — is what’s recommended from a month before conception until at least the end of the first trimester. Most people simply take a pregnancy multivitamin (which pairs folic acid with the also-important iodine) for the whole pregnancy, and that’s a good approach. Some people need a higher dose — if you’ve had a previous pregnancy affected by a neural tube defect, have diabetes, take certain epilepsy medications, or have a higher BMI, ask your GP, because the standard amount may not be enough for you and a prescription-strength dose may be recommended.

Food still counts. Leafy greens (the word folate comes from the Latin for leaf), legumes, oranges, eggs, avocado and fortified foods all contribute — and in Australia, bread-making flour has been fortified with folic acid since 2009, which has measurably reduced neural tube defects nationally. Eat these things happily, but don’t rely on food alone for the pregnancy dose: the supplement is what the evidence is built on, because it’s absorbed more reliably than food folate.

The FAQ round. Does it matter what brand? No — the folic acid in a supermarket generic is the same as in the fancy bottle; read the label, not the marketing. I missed a few days? Just carry on; consistency over weeks matters, not perfection. Can you take too much? Stick to the recommended dose or your doctor’s prescription rather than doubling up on multiple products — more isn’t better here.

If you’re reading this while trying to conceive: add the supplement to tonight’s routine and you’ve done the single most valuable nutritional thing on the list. And if you’re newly pregnant with questions about your dose or your risk factors, it’s a perfect one-line topic for your first GP visit — quick to ask, quickly answered, and then you can cross it off the worry list for good.