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The most common cause of vitamin B12 deficiency is a lack of dietary intake of the nutrient
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Vitamin B12 deficiency, if left untreated, can lead to neurological problems
However, high doses of vitamin B12, such as those used to treat a deficiency, might cause: Headache Nausea and vomiting Diarrhea Fatigue or weakness Its important to note that these side effects are generally mild and temporary
Clients should always consult with their doctors before trying new supplements or changes to their diet
These adaptations may explain why metabolic benefits can continue to improve over weeks to months of consistent use, rather than plateauing immediately
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