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occasional mild injectionsite reactions (redness/itch) may occur with subcutaneous administration
B12 deficiency may cause nerve damage, such as numbness and tingling in the hands and feet
B-12 is present in many food sources (mainly animal-based), where it is bound to the protein molecules in that food
Side effects are usually mild at normal doses
It is commonly referenced in preclinical and laboratory research examining cellular metabolism and enzyme-associated biochemical pathways within controlled research systems
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