funny taste in mouth after b12 injection Vitamin Shots Confer No Benefit vs. a Supplement Metallic Taste in Mouth: Common

Some people notice better rest within the first days of treatment, though this varies and should not be expected overnight

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Patients who have early Leber's disease (hereditary optic nerve atrophy) have been found to suffer severe and swift optic atrophy when treated with vitamin B12

Others suffer from gastrointestinal issues such as loss of appetite and constipation

Figure 1: Changes in gross morphological scores amongst the four experimental treatment groups