Folate is essential for cell division and DNA synthesis, making it important throughout life — but especially critical during pregnancy, when it plays a direct role in preventing serious birth defects. Here’s what folate does and how to make sure you’re getting enough.
What Is Folate?
Folate is the naturally occurring form of vitamin B9, found in a wide variety of foods, particularly leafy greens, legumes, and citrus fruits. It’s distinct from folic acid, the synthetic form used in supplements and food fortification — though both ultimately serve the same essential functions in the body once processed.
Why Folate Matters
DNA synthesis and cell division. Folate is required for synthesizing and repairing DNA, making it essential for any process involving rapid cell division — including normal growth, tissue repair, and red blood cell production.
Red blood cell formation. Along with vitamin B12, folate is necessary for producing healthy, properly formed red blood cells. Deficiency in either nutrient can lead to a type of anemia characterized by unusually large, immature red blood cells (megaloblastic anemia).
Fetal development. Adequate folate intake before and during early pregnancy significantly reduces the risk of neural tube defects, serious birth defects affecting the brain and spinal cord that develop in the earliest weeks of pregnancy — often before many people know they’re pregnant.
Homocysteine metabolism. Folate helps convert homocysteine, an amino acid associated with cardiovascular risk at elevated levels, into other compounds the body can use.
Food Sources
Good natural sources of folate include:
- Leafy green vegetables (spinach, kale, romaine lettuce)
- Legumes (lentils, chickpeas, black beans)
- Asparagus and broccoli
- Citrus fruits
- Avocado
- Fortified grains and cereals (often as folic acid)
Who Needs More Folate?
People who are pregnant or trying to conceive. This is by far the most well-established reason for prioritized folate intake, given its critical role in preventing neural tube defects during early fetal development.
People with certain genetic variations, such as MTHFR gene variants, which can affect how efficiently the body processes folate and may warrant a different approach to supplementation, ideally guided by a healthcare provider.
People with malabsorption conditions, including celiac disease or inflammatory bowel disease.
Heavy alcohol users, since alcohol interferes with folate absorption and metabolism.
Signs of Deficiency
Folate deficiency can cause:
- Fatigue and weakness
- Pale skin
- Shortness of breath
- Irritability
- Mouth sores or a swollen tongue
- In pregnancy, increased risk of neural tube defects in the developing fetus
How Much Do You Need?
Recommended daily intakes are:
- Adults: 400 mcg DFE (dietary folate equivalents)
- Pregnant individuals: 600 mcg DFE
- Breastfeeding individuals: 500 mcg DFE
Given the critical timing of neural tube development, health authorities generally recommend that anyone who could become pregnant maintain adequate folate intake even before conception is confirmed.
The Bottom Line
Folate plays a foundational role in DNA synthesis, red blood cell production, and fetal development, making adequate intake important throughout life and especially critical during the reproductive years. A diet rich in leafy greens, legumes, and fortified grains covers most people’s needs, though supplementation is specifically recommended for anyone who is pregnant or may become pregnant.
This article is for informational purposes only and is not a substitute for professional medical advice.
