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It helps with: DNA Synthesis : Its needed for making DNA, which controls all cell activities

But, different commercial preparations may vary

Vitamin B12 is generally found in foods of animal origin and is find in smaller levels in plant food however, some plant foods are fortified with vitamin B12, including breakfast cereals and nutritional yeasts

Tekland custom diet TD.170206, ENVIGO), and a second independent diet reproducing the composition of the standard 2014S diet which was supplemented with a vitamin mix without B12 (Vitamin A, Vitamin D 3 , Vitamin E, Vitamin K 3 , Vitamin B 1 , Vitamin B 2 , Niacin, Vitamin B 6 , Pantothenic Acid, Biotin, Folate and Choline) to ensure nutritional adequacy after autoclaving (Diet #2 in the text)

Stabler, S