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More on this: Vegan and vegetarian sources of B12 To diagnose a vitamin B12 deficiency, doctors A doctor may order blood tests if they suspect a person has a vitamin B12 deficiency, including a complete blood count and tests to check levels of B12 and folate in the blood
Even in liquid form, it will still last a year or two past the expiration date, unless it is compromised by mold
To help bypass any barriers to absorption in the GI tract, many healthcare providers recommend B12 injections for deficiency, but research shows that very high doses of oral B12 (1,000 to 2,000 mcg once a day) can normalize serum B12 levels to a similar extent with minimal side effects
doi:10.1677/JOE-07-0470
This vitamin is necessary for metabolizing fat
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