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Bureau of Business Research, College of Business and Public Administration, University of Arizona 2 (February 1953): 14

Animal products like meat, eggs, fish, and dairy contain B12

You might experience some brief stinging or burning at the injection site, or minor irritation

Some authors define brain doping as the use of non-invasive brain stimulation techniques to enhance athletes performance, such as transcranial direct current stimulation (tDCS) and transcranial magnetic stimulation (TMS), but this review does not cover this interpretation [6, 7]

Symptoms associated with B12 deficiency may include: Persistent fatigue or weakness Memory impairment or confusion Nerve-related issues such as numbness or tingling Mood fluctuations or depression Pale or yellowish skin A B12 deficiency can affect anyone, but older adults are particularly vulnerable