Physical Symptoms

• Folic acid can cause a bitter or foul taste of the mouth. In addition, a person may feel bloated or have an increased abdominal size, also know as abdominal distension.
  
  

Appetite

• People who use folic acid may also find that they do not feel hungry. They may have a decreased appetite.
  
  

Bowel and Bladder

• Folic acid can also cause increased gas or flatulence.
  
  

Mental Symptoms

• People who have been taking folic acid have reported trouble focusing and concentrating.
  
  

Sleep Problems

• Insomnia is also a reported side effect of people who take folic acid.
  
  

Dangerous Side Effects

• There are some dangerous side effects of folic acid that need to be reported immediately, These include trouble breathing, feeling that your throat is closing, the swelling of the tongue and hives.