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They are naturally occurring, biologically active, coenzyme forms of vitamin B12

By enhancing metabolic efficiency, Vitamin B12 shots may make it easier to maintain a calorie deficit

Each vial contains 0.9% benzyl alcohol , which acts as a preservative to prevent microbial growth, allowing for multiple withdrawals from a single vial without compromising sterility

They can be used, but because they lack a preservative they are better suited to single-use scenarios than to a solution drawn from over several days