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Better mood and increased energy were noticeable
Since vitamin B12 is derived from animal-based sources, individuals who do not eat meat or animal byproducts can experience deficiencies if they do not use supplemental sources
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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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