ddecd425____Norris_Cotton_Cancer_Center_Water_soluble_vitamins_Function
[Nutrient] Cobalamin (vitamin B12) [Sources] Meat, poultry, fish, seafood, eggs, milk and milk products; not found in plant foods [Function] 
Part of an enzyme needed for making new cells; important to nerve function
Vitamins: Their Functions and Sources | Health Encyclopedia | Norris Cotton Cancer Center
Function