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Vitamin B12 Enhances Good Mood and Helps Fight Depression Vitamin B12 is essential for the function of the brain, mood, and serotonin synthesis

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Vitamin B12 Retention in the Body The retention of vitamin B12 in the body varies depending on the form it is bound to

However, if serum cobalamin concentration is within the normal range, treatment should be continued at least monthly and the owner should be forewarned that clinical signs may recur sometime in the future

The stomach cells also produce a protein called intrinsic factor (IF), which travels to the small intestine