What are the side effects of folic acid?

Generally, folic acid is commonly administered in tablet form. Side effects of folic acid include gastrointestinal discomfort, interference with zinc absorption, allergic reactions, changes in urine color, and induction of seizures. Detailed analysis is as follows:

1. Gastrointestinal Discomfort

Excessive intake of folic acid may directly irritate the gastrointestinal mucosa, disrupting normal digestive and absorptive functions and affecting the rhythm and speed of gastrointestinal motility, thereby causing gastrointestinal discomfort. Symptoms may include nausea, vomiting, decreased appetite, bloating, and diarrhea.

2. Interference with Zinc Absorption

Long-term, high-dose folic acid intake may interfere with zinc absorption and utilization. Zinc is an essential trace element that plays a crucial role in maintaining normal immune function and growth and development. Impaired zinc absorption may lead to zinc deficiency, resulting in symptoms such as loss of appetite, decreased immunity, and delayed growth and development.

3. Allergic Reactions

A very small number of individuals may be allergic to folic acid due to their unique physical constitution. The immune system may recognize folic acid as a foreign antigen, triggering allergic symptoms such as rash, itching, erythema, and, in severe cases, even breathing difficulties and laryngeal edema.

4. Changes in Urine Color

After metabolism, folic acid's metabolites may be excreted through urine, causing the urine to turn yellow. However, this is usually a normal physiological phenomenon that does not cause substantial harm to the body. Urine color typically returns to normal after discontinuation of the medication.

5. Induction of Seizures

In individuals with a history of epilepsy, folic acid may affect the excitability of the central nervous system, interfere with the effects of antiepileptic drugs, and lower the seizure threshold, potentially inducing seizures.

When using folic acid, it should be taken at the normal prescribed dose under medical guidance to avoid overdose. Special populations such as pregnant women, lactating women, and children should consult a qualified physician or pharmacist before using folic acid.