how to give a b12 injection in the deltoid inject your arm Best Vitamin B12 Injection Sites:
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The breath-hold test also induced significant increases in CVCi in both age groups

(2004) Physical and functional interaction of growth hormone and insulin-like growth factor-I signaling elements
I did wonder if the progesterone I was taking to stop the migraines also lowered my B12 levels or effective response to it - I have injected 1.5mg every day for more than 8 years

Back in the day, humans likely consumed at least part of their vitamin B12 in the same way
