Folic acid rarely causes unpleasant side effects as long as people keep within the recommended dosage limits. However, sometimes a person does experience an adverse reaction. For example, they might start to feel sick, or they could notice that they have lost their appetite. The undesirable side effects could also take the form of difficulties getting to sleep and the production of excessive gas in the body. If any of these or other unexpected reactions occur, consult a doctor.

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