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Only approximately 1-4% gets absorbed via the gut, so taking B12 sublingually is the best absorption avenue (holding it under the tongue or between the gums and cheek is most common)
They may be used when oral supplements are insufficient, poorly tolerated, or when a more direct route of administration is appropriate
For a deeper dive into the research, see our guide on B12 injection efficacy, or read real patient reviews
Park SY, Ryu J, Lee W
With the rising incidence of diabetic neuropathy, peripheral nerve damage, anemia, and age-related vitamin deficiencies, the demand for high-quality methylcobalamin injections has grown significantly across hospitals, clinics, and nursing homes in India