Supplements and injections are effective ways to treat vitamin B12 deficiencies. These are the benefits and potential risks ...

If a person is unable to tolerate oral medication has persistent vomiting and is suffering from severe vitamin B12 deficiency ...

Vitamin B12 is also available by prescription as a nasal gel that’s sprayed into the nose—as well as through IV infusions, although there are mixed opinions on the efficacy and safety of this ...

"For example, vegans obtain vitamin B12 from fortified foods or supplementation, and guidance is available on on the Vegan Society's website." ...