Folic acid (vitamin B9) is an essential nutrient that helps the baby's cells grow and divide during the earliest weeks of pregnancy. During this critical period, the tissues that form the upper lip and palate develop rapidly.
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Although folic acid deficiency is not the only cause of these conditions, research shows it is one of the modifiable risk factors, making adequate intake an important part of prenatal care.
✅ What Are Cleft Lip and Cleft Palate?
A cleft lip is an opening or split in the upper lip that occurs when the facial tissues do not join completely during fetal development.
A cleft palate is an opening in the roof of the mouth caused by incomplete fusion of the palatal tissues.
These conditions may occur:
▪️ Cleft lip alone
▪️ Cleft palate alone
▪️ Both cleft lip and cleft palate together
The severity varies from a small notch to a larger opening that affects feeding, speech, hearing, and dental development.
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Folic acid supports:
▪️ Normal DNA production
▪️ Healthy cell growth
▪️ Formation of facial structures
▪️ Neural tube development
▪️ Normal fetal growth
Because the lip and palate develop very early—often before many women know they are pregnant—having enough folic acid before conception is especially important.
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Current scientific evidence suggests that insufficient folic acid intake is associated with a higher risk of orofacial clefts, although the relationship is complex.
Researchers believe that cleft lip and palate result from a combination of:
▪️ Genetic factors
▪️ Maternal nutrition
▪️ Environmental exposures
▪️ Certain medications
▪️ Smoking and alcohol use
▪️ Maternal health conditions
Therefore, folic acid deficiency alone does not directly cause cleft lip or cleft palate, but it may increase the likelihood, particularly in pregnancies with additional genetic or environmental risk factors.
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The risk is higher in women who:
▪️ Eat few vegetables, fruits, or fortified grains.
▪️ Have poor nutritional status.
▪️ Have certain gastrointestinal disorders that reduce nutrient absorption.
▪️ Take medications that interfere with folate metabolism.
▪️ Become pregnant without taking prenatal vitamins.
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Most public health organizations recommend:
▪️ 400 micrograms (mcg) of folic acid daily for women who may become pregnant.
▪️ Start at least one month before conception and continue through the first trimester.
▪️ Women with a previous pregnancy affected by a neural tube defect may require a higher dose, but only under medical supervision.
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Natural food sources include:
▪️ Spinach
▪️ Broccoli
▪️ Asparagus
▪️ Lentils
▪️ Beans
▪️ Chickpeas
▪️ Avocados
▪️ Oranges
▪️ Leafy green vegetables
Many countries also fortify cereals and flour with folic acid, helping improve intake.
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No.
Even with adequate folic acid intake, cleft lip and palate can still occur because they are multifactorial conditions involving both genes and environmental influences.
However, maintaining recommended folic acid intake is considered a safe, evidence-based preventive measure that may reduce the overall risk of several congenital abnormalities.
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Scientific studies consistently support the importance of adequate folic acid intake before and during early pregnancy. While the strongest evidence links folic acid to the prevention of neural tube defects, many observational studies and systematic reviews also suggest a protective effect against some cases of cleft lip with or without cleft palate.
The available evidence is not entirely consistent because genetics, maternal nutrition, lifestyle, and environmental exposures all influence fetal development. For this reason, healthcare professionals view folic acid as one component of a broader prenatal prevention strategy, rather than a guarantee against birth defects.
🎯 Recommendations
▪️ Take 400 mcg of folic acid daily if planning pregnancy.
▪️ Begin supplementation before conception, not after pregnancy is confirmed.
▪️ Eat a balanced diet rich in natural folate sources.
▪️ Avoid smoking and alcohol during pregnancy.
▪️ Attend regular prenatal visits for nutritional counseling.
▪️ Consult a healthcare provider before taking high-dose folic acid supplements.
▪️ Follow prescribed prenatal vitamins throughout early pregnancy.
✍️ Conclusion
Adequate folic acid intake is one of the simplest and most effective ways to support healthy fetal development. Although folic acid deficiency does not directly cause cleft lip or cleft palate, insufficient intake may increase the risk, particularly when combined with genetic and environmental factors.
Maintaining a healthy diet, taking the recommended folic acid supplement before pregnancy, and receiving regular prenatal care are practical steps that can help reduce the risk of congenital abnormalities and promote healthier pregnancies.
📚 References
✔ Centers for Disease Control and Prevention. (2025). Folic acid helps prevent some birth defects. https://www.cdc.gov/folic-acid/
✔ World Health Organization. (2023). WHO recommendations on antenatal care for a positive pregnancy experience. World Health Organization. https://www.who.int/
✔ Johnson, C. Y., Little, J., & National Birth Defects Prevention Study. (2008). Folate intake, markers of folate status and oral clefts: Is the evidence converging? International Journal of Epidemiology, 37(5), 1041–1058. https://doi.org/10.1093/ije/dyn174
✔ Wilcox, A. J., Lie, R. T., Solvoll, K., Taylor, J., McConnaughey, D. R., Åbyholm, F., Vindenes, H., & Vollset, S. E. (2007). Folic acid supplements and risk of facial clefts: National population based case-control study. BMJ, 334(7591), 464. https://doi.org/10.1136/bmj.39133.492951.BE
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