Why your body needs this essential B vitamin to build DNA and stay healthy

Health · Published 3 October 2026 Swipe more like this →

In short: Folate, or vitamin B9, is a fundamental building block for life. It is essential for creating DNA and producing healthy red blood cells. Without enough of it, your body struggles to function, leading to fatigue, neurological issues, and serious developmental risks during pregnancy. Understanding this nutrient is vital for long-term health.

Folate is an essential nutrient that the human body cannot produce on its own, making dietary intake critical. It serves as a key coenzyme in one-carbon metabolism, a process required for the synthesis of DNA and RNA, as well as the maturation of blood cells. Because it is found in dark-green leafy vegetables, the term 'folic' is derived from the Latin word folium, meaning leaf. While natural folate is found in foods like beans, eggs, and meat, folic acid is a synthetic, more stable form used in supplements and food fortification.

A deficiency in folate can lead to megaloblastic anaemia, where the body produces abnormally large red blood cells that fail to carry oxygen effectively. Symptoms range from extreme tiredness and muscle weakness to psychological issues like confusion or depression. In severe cases, long-term deficiency can cause irreversible damage to the nervous system. The condition is particularly dangerous during pregnancy, as folate is crucial for the development of a fetus's brain and spinal cord. Insufficient levels are linked to neural tube defects such as spina bifida and anencephaly, as well as risks of premature birth and low birth weight.

Beyond blood health, folate plays a complex role in chronic disease management. Research suggests that low folate levels are associated with type 2 diabetes, where it may help lower homocysteine concentrations and suppress oxidative stress. However, balance is key; while supplementation can reduce the risk of cardiovascular disease and cognitive impairment, some studies indicate that high doses of folic acid may be linked to an increased risk of prostate cancer. Because the body cannot store large amounts of natural folate, maintaining steady intake through a balanced diet or targeted supplementation remains a cornerstone of preventative health.

General information, not professional advice. Spotted an error? Flag the card or see corrections and complaints.

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