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Your body stores 1,000 to 2,000 times as much vitamin B12 as you would typically eat in a day, so the symptoms of vitamin B12 deficiency can take several years to appear

Some patients notice improved energy or mental clarity within 2448 hours, whilst others experience no immediate change, particularly if deficiency is severe

The short answer is: it depends on what symptoms you have and how deficient you are

Sufficient B12 in the diet lowers the risk of age-related macular degeneration

The administration of live vaccines is contraindicated in patients receiving immunosuppressive doses of corticosteroids

Now, B12 helps regulate the nervous systems response