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B12 deficiency can lead to several health issues, which include anemia characterized by fatigue, and weakness
Side effects such as nausea, constipation, acid reflux, stomach pain, vomiting, diarrhea, and injection site reactions are common
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This deficiency can also be prevalent in heavy smokers and drinkers
B12 helps with healthy brain function, blood cells, and nerves and assists with energy, performance, and endurance
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