Folate vs Folic Acid: What's the Difference and Why Both Matter

Folate and folic acid are two names that get used almost interchangeably in pregnancy advice, and while they’re closely related, they’re not identical — and understanding the difference explains why the NHS recommends both eating folate-rich food and taking a folic acid supplement, rather than treating one as a substitute for the other.

Folate: The Natural Form

Folate is the naturally occurring form of vitamin B9, found in foods like leafy green vegetables, broccoli, beans, lentils, and fortified breakfast cereals. It’s essential for cell division and DNA synthesis, which makes it particularly important during the rapid cell growth of early pregnancy.

Folic Acid: The Synthetic Form

Folic acid is the synthetic, lab-made version of the same vitamin, used in supplements and to fortify foods. The reason it’s specifically recommended as a supplement rather than relying on dietary folate alone comes down to absorption and reliability: folic acid is absorbed more consistently and predictably than folate from food, and it’s much easier to guarantee a precise daily dose from a tablet than from diet, where intake naturally varies day to day.

Why the NHS Recommends Both

Current NHS guidance is to take a 400mcg folic acid supplement daily from before conception (ideally at least a month before trying to conceive) through to the end of the first trimester (week 12), and to eat folate-rich foods throughout pregnancy. This isn’t redundant — the supplement provides a guaranteed, reliable baseline dose specifically during the highest-risk window for neural tube development, while dietary folate contributes to overall nutrition throughout the rest of pregnancy when the supplement is no longer specifically recommended (though continuing to eat folate-rich food remains beneficial).

Why Folate Matters So Much in Early Pregnancy

Adequate folate/folic acid intake around conception and in the first 12 weeks significantly reduces the risk of neural tube defects, including spina bifida — conditions that arise from incomplete closure of the developing spinal cord, which happens very early, often before many women know they’re pregnant. This is exactly why the recommendation starts before conception where possible, rather than only once pregnancy is confirmed.

Best Dietary Sources of Folate

• Dark leafy greens — spinach, kale, broccoli
• Pulses — lentils, chickpeas, black beans
• Fortified breakfast cereals (check the label for added folic acid)
• Asparagus and Brussels sprouts
• Oranges and orange juice

Higher-Dose Supplements

Some women are advised to take a higher 5mg dose of folic acid rather than the standard 400mcg — this applies if you have a higher risk of neural tube defects, for example due to diabetes, taking certain anti-epileptic medications, a BMI over 30, or a family history of neural tube defects. This is a prescription-strength dose, so it’s worth mentioning any of these factors to your GP or midwife early, ideally before conceiving, so the right dose is confirmed rather than assumed.