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Group 1 received a saline injection as a control
According to the NIH Office of Dietary Supplements, vitamin B12 is available as cyanocobalamin and hydroxocobalamin, which are typically administered parenterally by intramuscular injection to bypass gastrointestinal absorption barriers
To our knowledge, several narrative reviews, including patients with Biermers disease, have reported preliminary data of the efficacy of oral vitamin B12 treatment [3,10,18,19]
Other common signs include having trouble thinking clearly, struggling with memory, or experiencing mood swings that feel out of character
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