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Vitamin b12 helps with the development and reproduction of new cells including those in your skin, nails and hair

Results May Vary: Individual results will vary based on factors including age, baseline health condition, lifestyle factors, consistency of use, genetic factors, current medications, and other individual variables

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This makes it work faster

What Is A B12 Shot

That is a genetic-knockdown study in mice, not a drug trial: it tells you the target is real and metabolically meaningful in an animal model, but it does not test a drug, a dose, or a route