b12 injected into blood vessel Vitamin Injection Sites: All You Need to Know How to Give a B12

Although the injections are probably innocuous, they are unlikely to help your weight-loss efforts and may interfere with other medications, according to nutritionist Katherine Zeratsky of the MayoClinic.com

doi: 10.1091/mbc.E04-03-0224

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Some doctors prescribe a vitamin B12 shot regularly, which they can give you in the office or teach you to do it yourself at home

If you're dose is higher than 1mL, avoid injecting into the upper arm