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They may be used by people who do not get enough B12 through diet, such as some vegan or vegetarian patients, or by people who want to maintain their intake
Injections deliver B12 directly into the bloodstream, making them more effective than oral supplements in certain cases
These can also trigger a rare allergic reaction called anaphylaxis
Vitamin B12 deficiency recovery can take time, six to twelve months, but with ongoing supplements, improvement should be gradual
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