intramuscular vitamin b12 injection Cambridge IM Injections Best Vitamin B12 Injection Site:
Description
Important caveat: Side effect data comes primarily from animal studies

Female participants in the study did not demonstrate an increased risk of lung cancer

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doi:10.3389/fcvm.2018.00001 Santilli F, Dav G, Patrono C

Also, dont inject expired B12
Why should you get B12 injections
