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vitamin b 12

• (Science: chemical) A cobalt-containing coordination compound produced by intestinal micro-organisms and found also in soil and water.

• A water-soluble vitamin needed for to make red blood cells and dna, and to keep nerve cells healthy.

• It is found in eggs, meat, poultry, shellfish, milk, and milk products. Higher plants do not concentrate vitamin b 12 from the soil and so are a poor source of the substance as compared with animal tissues.

• also called cobalamin, or Cyanocobalamin