Folic acid is a water-soluble B vitamin. Usually, many foods on our table are rich in folic acid, such as animal liver, kidney, eggs, fish, and leafy vegetables, spinach, celery, cauliflower, potatoes, lettuce, broad beans, pears, oranges, bananas, lemons, nuts and soybeans in plant foods, all of which are foods with high folic acid content. Therefore, eating folic acid itself has no side effects. The recommended normal intake is 400 micrograms per day. If taken in excess, the following side effects may occur:

1, folic acid can cover up the early manifestations of vitamin B 12 deficiency, resulting in damage to the nervous system.

2, taking folic acid 350 mg may affect the absorption of zinc, and lead to zinc deficiency, so that fetal growth retardation, low birth weight infants increase.

3. Taking folic acid can interfere with the effect of anticonvulsants and induce seizures in patients.

4. Individual patients who take folic acid in large quantities for a long time may have gastrointestinal symptoms such as anorexia, nausea and abdominal distension.

5, when taking a lot of folic acid, yellow urine can appear.