what's a b12 injection Shots at Home: How, Where & How Often to Inject Yourself How to Give a B12

Moisten a cotton ball with rubbing alcohol and use it to wipe the skin at the injection site

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However, long-term NNMT inhibition in humans hasn't been characterized beyond small pilot cohorts, so concerns about sustained NAD+ elevation (which could theoretically promote certain cancers via PARP or SIRT activation) remain speculative but unresolved

The Shoulder If someone is giving you a B12 injection in the shoulder, have them make a downward-facing v-shape with your thumb and forefinger over the deltoid (shoulder) muscle