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Description
Clinical usefulness of intrathecal injection of methylcobalamin in patients with diabetic neuropathy

H., Tey, Y

Individuals with conditions such as pernicious anemia, gastrointestinal disorders, or post-surgical digestive changes may lack sufficient intrinsic factor, making oral absorption inefficient
The frequency of your B-12 injections can also be influenced by factors such as diet, lifestyle, and absorption issues

Below are the general guidelines provided by the National Institutes of Health : The exact side effects of vitamin B12 in high doses arent well-documented