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Our observation that intracellular NA concentrations did not increase following NNMT inhibition extends previous studies that showed NA concentrations were largely unaffected following NNMT knockdown with either adenovirus[39] or anti-sense oligonucleotides (ASOs).[12] It is possible that significant accumulation of NA in adipocytes (and other tissues) is prevented by rapid conversion of NA to NMN and subsequent NAD + synthesis or transport to the extracellular environment.[27] Importantly, NNMT inhibition potentiated the absolute intracellular concentrations of NAD + and SAM, without altering the levels of NA and SAH in the adipocytes

If needles aren't your thing, B12 supplements are also available in capsule, tablet, and liquid forms, which can often be purchased over-the-counter (via Medical News Today)

Lipotropic amino acids include methionine, inositol, and choline to mobilize fat and adenosine and L-carnitine to increase your metabolism