Never store the liquid solution at room temperature
Discuss your medical history, particularly if you have cuts, sores or bleeding in the intended injection area or if you have a history of heart problems, kidney disease, liver disease or methemoglobinemia, a specific blood disorder
Vitamin B12 Deficiency and Mood Disorders: A deficiency in vitamin B12 can contribute to a variety of neurological and psychiatric symptoms, such as mood changes, irritability, and even depression
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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