Marilyn watched Dr. Oz's TV show and followed his recommendation to make sure to get 700 mcg of folic acid a day by taking a daily multivitamin, half in the morning and half at night. At first it seemed to help, she didn't have to put in her hearing aid before answering the telephone in the morning, but later her hearing worsened anyway.
Might be worth a try if your hearing isn't what it used to be.