how to get b12 injection self-inject intramuscular vitamin - Overview How Long Does It Take
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Finer than 27 gauge should not be used, because of the danger of it breaking whilst in your flesh

Comparing the efficacy and tolerability of a new daily oral vitamin B12 formulation and intermittent intramuscular vitamin B12 in normalizing low cobalamin levels: a randomized, openlabel, parallelgroup study
What are the benefits of b12 injections

This peptide works by stimulating the production of telomerase, an enzyme that repairs and extends telomeresthe protective caps at the ends of chromosomes that naturally shorten as we age