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2020 ed.)
The vitamin is released from dietary proteins by pepsin (an enzyme secreted in the stomach) and activated by hydrochloric acid
B12 supports energy metabolism, and deficiency can cause fatigue
There are some very rare side effects listed in medical literature (mostly when large doses are given): for example, one out of many thousands of patients might develop a disturbance in liver enzymes or a tingling in the fingers or toes
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