b12 injected into blood vessel

It is given by intramuscular or subcutaneous injection https://www.jadeaesthetics.co/_next/image?url=%2Fimages%2Fservices%2Fnad.jpg&w=3840&q=75 what gauge needle is used for b12 injections vitamin injection size do i need should use Anemia treatment Size:1000 mcg/ml - 30 ml x 4

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