b12 injections better than tablets Vitamin vs. Supplements: Which Works Best? Oral vitamin B12 versus intramuscular

By designing different transcription activator-like protein structures, it can specifically recognize and bind to different DNA sequences

How to Switch from Pills to Injections If you have been taking oral supplements but still feel tired, foggy, or "off," it may be worth reevaluating, ideally starting with a test rather than a guess

B12 helps your nervous system operate smoothly

NNMT is an enzyme that catalyzes the methylation of nicotinamide (a NAD+ precursor) and other substrates, using SAM (S-adenosylmethionine) as the methyl donor

NIH National Library of Medicine

The effective potency could be a fraction of what the label states