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Vitamin B12 is an essential Vitamin that is responsible for many bodily functions and provides numerous health benefits, so you should try to maintain a healthy amount of B12 in your body via diet and supplementation

you have to get it through food or B12 supplements

When stratified by administration route, the mean percentage changes were: Intramuscular (IM): 307% Oral: 285% Sublingual: 199% IM administration showed the highest average B12 increase, although oral and sublingual routes also yielded substantial improvements, supporting their use as effective and less invasive alternatives

Needle Dead Space Dead space within the needle hub and shaft affects the dosage accuracy in B12 injections

Any excess is filtered out of your system and excreted through your urine