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383, 20 Nov
If you are over the age of 59, there is a 6% chance that you will develop vitamin B12 deficiency
There are different size needles for subcutaneous and intramuscular injections, so be sure to discuss your B12 injection site intentions with your doctor and follow his or her recommendation
But I also back this up with other tests that look at how your body utilises B12 to check you have enough
However, the effectiveness of B12 injections may vary from person to person
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