B12 deficiency is associated with the conditions of , vertigo, tinnitus, and hearing loss. Though nerve damage can be permanent, B12 can at least stop some of its progression by helping to produce myelin to recoat the axons. I had mild hearing loss, mild tinnitus, and severe vertigo. They are now gone. My husband has familial hearing loss and moderate tinnitus. He hasn't worsened, but he hasn't noticed improvement yet after 5 mnths. of B12 supplementation. I recommend a trial of methylcobalamin, an active form of B12, between 1000 mcg. - 5000 mcg. daily, available in sublingual lozenges. My husband takes 2500 mcg. daily, and I now take 5000 mcg. daily. With these high dosages, we find that we need extra potassium in our diets, but that side effect is what I would rather tolerate than the vertigo, nerve damage, etc. Some people have also found that supplementation with zinc, CoQ10, and vitamin E have been helpful, along with a reasonable amount of B-complex.