how and where do i give a vitamin b12 injection Shots at Home: How, & Often to Inject Yourself A Retired RN About Vitamin
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I don't know which B12 sort you have been injecting, but some people definately cannot handle cyanocobalamin

Bruckbauer et al

The receptor is specific to the IF-B 12 complex, and so will not bind to any vitamin content that is not bound to IF
