The number of pills of vitamin B12 needed to nourish the nerves in a day depends on different situations, as follows:
1. General situation: The commonly used tablets of vitamin B12 are 25 micrograms per tablet, and the recommended daily intake for adults is around 2-4 micrograms. Therefore, in general, about 1 tablet is needed to nourish the nerves.
2. Peripheral nerve damage: Usually requires taking 100 micrograms per day, which is 4 tablets of 25 micrograms each.
3. Central nervous system damage: Usually requires taking 200 micrograms per day, which is 8 tablets of 25 micrograms each.
The specific dosage should be determined based on individual circumstances and doctor's advice to avoid excessive intake.