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For example, a 2019 study of over 9,000 adults found people with obesity had lower blood levels of vitamin B12 (8)
By carefully considering these factors and selecting the appropriate needle size for B12 injections, healthcare providers can promote effective, safe, and comfortable administration of the vitamin
Vitamin B12 injections are generally safe side effects are mild
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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