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Weight loss does slow after 6-12 months, but this is because you weigh less and need fewer calories, not because the medication stops working
Energy levels improve fast because B12: Delivers oxygen more Helps make red blood cells Boosts how mitochondria work Balances alertness-related brain chemicals Helps stabilize metabolism Energy levels can differ between individuals, but many notice steadier stamina and reduced afternoon tiredness once they begin treatment
A B12 deficiency can happen due to age, low absorption, low IF levels, or diet
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