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126 In a randomized controlled trial, 40 patients with tinnitus (17 of whom also had vitamin B12 deficiency with levels below 250 pg/mL) were treated with weekly intramuscular injections providing 2,500 mcg vitamin B12 or saline (placebo) for six weeks

Diabetologia 60 , 296305 (2017)
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Diabetes often causes significant damage to the ENS, resulting in GI dysfunctions that greatly affect the quality of life of patients

Allergic reactions are possible, though infrequent