Older people are more likely to have a deficiency because they might not absorb vitamin B12 as well as they used to
How to Administer a B12 injection to Yourself There are two ways to self-inject vitamin B12: Subcutaneously, or just below the skin, and intramuscularly, which goes directly into the muscle, says Foxx
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B12 is found mainly in animal foods and cannot be manufactured in the human body
If you're unsure which option is right for you, discuss your symptoms, medical history, and lab results with your healthcare provider before beginning supplementation