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You might hear about different kinds of B12 used in injections

The 10 mg lyophilized vial format supports both subcutaneous research administration and in vitro / cell-culture applications

it contributes to the formation of the protective covering around nerves, known as the myelin sheath, and its deficiency can cause neurological issues like numbness and tingling in the hands and feet

Goodman says, though some people require them for the long term. Your healthcare provider will make recommendations based on your B12 level, age, diet and overall health

Perhaps most notably, the researchers observed no adverse effects even at high doses