When Alison Hawe took her 9-year-old son to his doctor several years ago, she followed the physician’s advice by giving the boy folic acid because of his celiac disease diagnosis. Ms. Hawe didn’t initially realize the B vitamin could be triggering her son’s erratic, hyperactive behavior.
After investigating, she learned that some patients—especially those with certain genetic variations—react negatively to folic acid supplements and fortified foods.
