b12 injections subcutaneous or intramuscular should be injected subcutaneously intramuscularly injection Choosing the Right Needle and Syringe for subcutaneous vs intramuscular

How to Give Yourself a B12 Injection | ThinWorks

Patients typically feel the increased energy, mental clarity, and mood enhancement from each B12 injection for 5-15 days on average before it tapers off

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The Mayo Clinic indicates high doses of vitamin B-12, such as those used to treat a deficiency, might cause: Headache Nausea and vomiting Diarrhea Fatigue or weakness Tingling sensation in hands and feet Healthline says: In very rare cases, some people can experience side effects caused by allergic reactions or sensitivity In addition to helping athletes build muscle, vitamin B12 plays a role in maintaining nervous system function and brain health