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where to administer vitamin b12 injections Optimal Injection Sites for Maximum Absorption and Benefits How to Inject Vitamin B12
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How Effective Are They

Older people also absorb less B12 since their stomach acid decreases with age

Your arm may feel heavy, itchy or slightly bruised at the injection site but these side effects generally pass quickly

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To sum up, what happens if you inject B12 into fat rather than into muscle