how to give b12 injections to myself at Home - Safety Guide for Self-Administration 💉 HOW TO SELF-INJECT B12
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However, some people have difficulty absorbing vitamin B12 from their diet, including dietary restrictions, certain medical conditions like pernicious anemia, or medications that interfere with B12 absorption
NAD+ and autophagy in dermal fibroblasts Your cells need enough NAD+ to power their recycling system - autophagy

both simply describe why the research protocol looks the way it does

Cyanocobalamin injection may be prescribed to treat or prevent B12 deficiency related to pernicious anemia, absorption problems, certain medications, or strict vegan diets