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Taking a large dose before drinking does not help stave off a hangover, as alcohol can reduce your absorption of B vitamins
This means their safety and effectiveness cannot be confirmed
The vitamin is more quickly absorbed when administered in injection format, but this is also what makes it so effective for weight loss
This can lead to tiredness, weakness, and shakiness, as well as mood changes
Summary Vitamin B12 injections can be an effective way of treating a deficiency
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