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Injections can improve memory, focus, and mental clarity, particularly in individuals with B12 deficiency
Informal reports sometimes describe body-composition changes after 4 to 6 weeks, while animal studies measured changes over 11 to 28 days
For maintenance, most patients receive one injection every 2 to 3 months
Vitamin B12 deficiency has occurred in breastfed infants of vegetarian mothers whose diets contain no animal products (e.g., eggs, dairy), even though the mothers had no symptoms of deficiency at the time
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