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Frequency Due to the different ways in which the body absorbs B12, each form of supplement has a different frequency with which you need the treatments

In other words, pills can take longer to raise B12 levels, so if you need a quick boost, injections are the better choice

Sublingual (under-the-tongue) forms dissolve in your mouth, theoretically enhancing absorption by allowing some B12 to enter the bloodstream through mucous membranes rather than relying solely on digestive uptake

However, absorption challenges and individual variability in effectiveness have led many Richmond healthcare providers to recommend vitamin B12 injections as a more reliable delivery method