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Lancet 392 , 15191529 (2018)
The person would see the results of vitamin B12 after 1 to 3 days of administration

Side effects B12 injections are generally considered safe with minimal side effects when administered appropriately
This could be because the Vitamin B12 is helping to regulate your cells and their metabolic cycles, and it could be because you use more energy during the day, thus napping less and finding your body ready for sleep at night