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The outer skin may be pulled away from the muscle tissue to ensure the needle doesn't pierce the muscle
Factors such as initial B12 levels, underlying medical conditions, certain medications, advanced age, and injection frequency can affect the absorption and utilization of B12, possibly shortening the duration of action
If vitamin B12 injections are not suitable or necessary for your situation, alternative supplementation methods such as oral supplements or patches may be recommended by your healthcare professional
Notably, the body stores some vitamin B12 in the liver, which can last for years
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