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Patients with severe neurological symptoms of vitamin B12 deficiency
require immediate treatment with an intensive regimen of cyanocobalamin over 1 month, followed by ongoing maintenance doses. Patients with mild to moderate symptoms of vitamin B12 deficiency should be started and continue on maintenance-level doses of cyanocobalamin.
Most people can prevent vitamin B12 deficiency by consuming enough meat, poultry, seafood, milk, cheese, and eggs.
If you don't eat animal products or you have a medical condition that limits your absorption of nutrients, experts recommend taking a B12-containing multivitamin
and eating breakfast cereal fortified with vitamin B12.
If you experience symptoms of B12 deficiency, speak to your doctor about a blood test
to check B12 levels.
Hope I have answered your query.
Wishing you good health.