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Serum B12 peaks 2448 hours post-injection and sustains elevated levels for approximately 34 weeks

Adverse Reactions/Side Effects Generalized: Anaphylactic shock and death have been reported with administration of parenteral vitamin B12 (see WARNINGS)

Conditions such as atrophic gastritis (thinning of the stomach lining), Pernicious anemia (which makes it harder for your body to absorb Vitamin B12), Intestinal diseases such as crohns disease, celiac disease, bacterial growth and immune system disorders such as Graves disease or lupus can lead to Vitamin B12 deficiency in the body

In Ontario, Vitamin B12 injections are not covered by OHIP

The most appropriate option depends on individual needs