New research has apparently found that folic acid supplements delay hearing loss related to aging in low frequency sounds. The benefit of increased folic acid intake from food and/or supplements is especially marked in men over the age of 60. This is good news, as loss of hearing can be socially very isolating for older individuals, as it makes socializing with others more difficult in social situations such as mealtimes when extraneous ambient noise can make it especially hard to discern certain voices or sounds.
Interestingly, in the recent studies, vitamins C, E and beta-carotene do not have benefits for hearing, in contrast with folic acid.