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In terms of safety, B12 is naturally occurring in the body and therefore (even in large doses) is relatively safe
The one real argument for injecting is bypassing first-pass metabolism, and the strength of that argument depends entirely on which bioavailability study you believe (3.5% in mice versus 38.4% in rats)
Though vitamin B12 shots can benefit anyone looking to boost their energy or metabolism, certain groups are more likely to see dramatic improvements: Also, anyone on a weight loss plan can benefit from B12
Please consult your veterinarian if you have any questions
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