Vitamin B12 is well known to be the 'nerve vitamin'. A serious deficiency of it can have serious damaging effects on the brain and nervous system and therewith on the whole body and mind. Even smaller deficiencies may cause fatigue, depression and poor memory. Tinnitus, being a nervous condition, can also be the result of a Vitamin B12 deficiency (or at least worsened by it). On the other hand, Vitamin b12 supplements may well improve the condition, at least as long as they are taken. I personally also feel a noticeable improvement within a short time after taking even only a low dosage Vitamin B combi supplement (corresponding to 100% RDA i.e. 2.5 mcg Vitamin B12). Vitamin B12 can be taken without any side effects in much higher dosages if required in case of more serious deficiencies (the body will excrete any excess amounts). Moreover, it can be rather cheaply obtained, so for anybody looking into ways to improve (if not cure) the tinnitus condition by means of nutritional supplements or medication should look to Vitamin B12 first before embarking on more expensive options or ones associated with various side effects. It should be noted however, that it my be required to stop taking any substances that oppose the action of Vitamin B12, like caffeine alcohol and other substances that tend to aggravate the tinnitus on their own.