Folic Acid Supplement: Benefits, Dosage, Food Sources, Pregnancy and Safety

Folic acid is one of the most important forms of vitamin B9, a nutrient the body needs to make DNA, produce new cells, and support normal growth and development. Although folate is naturally found in foods, folic acid is the form commonly used in supplements and fortified foods.

Folic acid is especially important before and during early pregnancy because adequate intake can help reduce the risk of neural tube defects, serious birth defects affecting a baby's developing brain and spine. Importantly, these defects can develop during the first few weeks of pregnancy, sometimes before a woman knows she is pregnant.

Begin Health Life presents a clear explanation to folic acid supplement, elucidating what folic acid does, who needs it, recommended amounts, pregnancy benefits, food sources, deficiency, and safety.

What Is Folic Acid?

Folate is the general name for the different forms of vitamin B9. Folic acid is a stable form of folate used in dietary supplements and fortified foods, while naturally occurring folate is found in foods such as leafy green vegetables, beans, peas, nuts, and oranges. Some supplements contain 5-MTHF, or methylfolate, instead of folic acid. Both are forms of vitamin B9, but they are chemically different.

The body uses folate in several important processes, including DNA production and cell division. This makes it particularly important for tissues where cells are developing and being replaced rapidly.

Folic acid and folate are often used interchangeably, but they are not exactly the same. Folic acid is a specific form of the vitamin, while folate is the broader term.

Why Do We Need Folic Acid?

Adequate folate supports normal cell growth and the production of genetic material. It also contributes to the formation of healthy red blood cells.

When folate intake is too low for a prolonged period, the body can develop folate deficiency anemia. Folate deficiency may cause:

• Tiredness
• Weakness
• Headaches
• Difficulty concentrating
• Irritability
• Heart palpitations, and 
• Shortness of breath

However, folic acid supplements are not necessary for everyone. Many people can obtain sufficient folate from a varied diet, while supplementation becomes particularly important in certain situations, especially pregnancy planning.

Folic Acid and Pregnancy

Pregnancy is the most important reason folic acid supplementation receives so much attention.

The neural tube is the early structure that develops into a baby's brain and spinal cord. It closes very early in pregnancy, generally during the third and fourth weeks. If it does not close properly, neural tube defects such as spina bifida and anencephaly can occur.

The CDC recommends to consume 400 micrograms (mcg) of folic acid every day for 19 and older. Taking it before pregnancy and during early pregnancy is important because neural tube development occurs so early. FDA recommends that the requirement of 600 mcg dietary folate equivalents (DFE) during pregnancy and 500 mcg DFE during breastfeeding.

For women planning pregnancy, starting at least one month before conception is specifically recommended. NHS guidance advises starting before pregnancy, ideally around three months beforehand, and continuing through the first 12 weeks.

Women who have previously had a pregnancy affected by a neural tube defect may be advised to take a much higher dose, 4,000 mcg daily, beginning one month before conception and continuing through the first three months of pregnancy. This higher dose should be taken under medical guidance rather than self-prescribed.

Folic Acid Food Sources

A healthy diet remains an important source of vitamin B9. Foods naturally rich in folate include:

• Spinach and other dark green leafy vegetables
• Beans and peas
• Asparagus
• Brussels sprouts
• Oranges and orange juice
• Peanuts and other nuts
• Liver

Folic acid is also added to some fortified foods, including certain breads, flour, pasta, rice, breakfast cereals, and corn-based products.

Food alone may not reliably provide the recommended folic acid intake for someone who could become pregnant, which is why supplementation is specifically recommended before, during and after pregnancy.

Who May Need a Folic Acid Supplement?

Besides people planning or capable of becoming pregnant, supplementation may be recommended for people diagnosed with folate deficiency or certain types of anemia. Some medical conditions, restrictive diets, alcohol use, and problems affecting nutrient absorption can increase the risk of deficiency.

Certain medicines can also affect folate. For example, some antiseizure medicines may lower folate levels, while anti-inflammatory medicines like sulfasalazine can interfere with folate absorption. Immunosuppressant like Methotrexate also interacts with folate, although the appropriate approach depends on why methotrexate is being used. Anyone taking these medicines should discuss the folate supplementation with a healthcare professional.

Is Folic Acid Safe?

Folic acid is generally safe at recommended amounts. However, more is not necessarily better.

For adults, the U.S. tolerable upper intake level for folic acid from supplements and fortified foods is 1,000 mcg per day, unless a healthcare professional recommends a higher amount for a specific medical reason. This upper limit does not apply to naturally occurring folate in foods.

Taking large amounts of folic acid can also complicate the diagnosis of vitamin B12 deficiency. High folate intake may improve the anemia associated with B12 deficiency while neurological damage from the deficiency can continue. This is one reason high-dose supplementation should not be used casually.

Final Takeaways

Folic acid is a small nutrient with an important role in cell growth, DNA production, and healthy development. A balanced diet can provide plenty of natural folate, but 400 mcg of folic acid daily is particularly important for women who could become pregnant, because it helps reduce the risk of serious neural tube defects.

For people with deficiency, certain medical conditions, medication-related risks, or a history of a pregnancy affected by a neural tube defect, the appropriate dose may be different. Begin Health Life does not recommend the high-dose folic acid without professional guidance rather than simply assuming that a larger dose provides greater health benefits.