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As a result, eating a restrictive diet, such as a strict vegetarian or vegan diet, can lead to B12 deficiency

B12 oral supplements are also readily available but these take longer to work and there is no guarantee that the body will absorb them effectively due to the digestion process

In-vitro assays show the molecule is membrane-permeable, which supports the possibility of oral absorption, but the animal efficacy studies used injection, and no study has directly compared oral versus subcutaneous bioavailability

Even If you have not had any of the symptoms of someone who is B12 deficient, it would not hurt to inquire about the benefits of B12 shots