B12 supplement and vegetarian diet

Foods of animal origin, such as meat, fish, offal and eggs, are good sources of vitamin B12.

Vitamin B12 is needed for a healthy nervous system and the formation of red blood cells.

Some people who avoid all animal foods - meat, fish, eggs and dairy foods - will probably need a vitamin B12 supplement. Check with your GP or dietitian.

The above information was extracted

from:http://www.alzheimers.org.uk/site/scripts/documents_info.php?categoryID=200208&documentID=364