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Manufacturers may fortify certain foods, such as cereals, with the synthetic form of vitamin B12
Neurologic symptoms include neuropathy, ataxia, retrograde amnesia, impaired ability to learn, and confabulation
Table 1 Description and level of evidence for articles reviewed
According to the 2025 meta-analysis by Alfalasi and colleagues, sublingual B12 showed an approximate 199% mean increase in serum B12 compared to approximately 307% for intramuscular injections
Vitamin injections have been used for decades as a means of delivering important vitamins and minerals directly into the bloodstream
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