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This area is often chosen because it provides a large, well-developed muscle that can accommodate the injection without causing discomfort
If you see any air bubbles, lightly tap or flick the syringe to draw the bubbles to the top (the end with the needle) and expel the air
It can take a few years to develop a deficiency because your body can store B12 in your liver for a long time
Both scenarios are valid depending on the underlying health context
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