Explanation:

Vitamin B12, or Cobalamin, is one of the eight B vitamins. It is needed to ensure the proper functioning and health of nerve tissue, brain function, and red blood cells. Like all B vitamins, vitamin B12 is a water-soluble vitamin. This means it dissolves in water and travels through the bloodstream. The human body does not store cobalamin. Any excess or unwanted amounts are excreted through urine. Vitamin B12 deficiency can result in irreversible and potentially severe damage, especially to the human nervous system and brain. It can also cause anemia. Even at slightly lower-than-normal B12 levels, a person canexperience depression, confusion memory problems and tiredness. However, these symptoms are not specific enough to diagnose vitamin B12 deficiency.

Deficiency of vitamin B12 in mothers during pregnancy may put their child at greater risk of metabolic problems such as type-2 diabetes. Vitamin B12 is naturally found in animal products, including fish, meat, poultry, eggs and milk, meaning deficiency is more likely in those following a vegan diet.