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needle for b12 injections How to Give a Injection: Step-By-Step Instructions what needle is used for
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This can cause fatigue, weakness, and shortness of breath

But the timing of these results can vary depending on factors like how low your B12 levels were initially and how well your body absorbs the vitamin

2002 Nov-Dec;21(6):216-8

reported that a genetically predicted high vitamin B12 level was associated with higher OR and (95% CI) for colorectal cancer [20]
