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Due to the complicating factor of a shot and the extra cost, it seems the best route for most people is to focus on getting adequate B vitamins from food, and supplement as necessary.
B12 injections are often better than taking oral vitamins because they are absorbed faster and work directly
stick to injections
The biggest variable is dietary behavior
They tend to be expensive and vary with different manufacturers
For others, it takes a couple of injections
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