vitamin b12 injection vs pill Injections vs. Supplements: Which Works Best? Vitamin B12 Tablets vs Injection

J Affect Disord (2012) 141:7985

NNMT is an enzyme that methylates nicotinamide (vitamin B3) using S-adenosylmethionine (SAM) as a methyl donor

Most users plan multiple cycles as part of a comprehensive metabolic optimization strategy

Others who might be prescribed B12 shots are those at the highest risk for a B12 deficiency, including: Vegans, since vitamin B12 is found only in animal products People ages 60 and up since their bodies don't absorb B12 as efficiently People with Crohn's disease or pancreatic disease, since they prevent nutrient absorption People who had weight-loss surgery, which decreases B12 absorption People with an eating disorder People with HIV People with diabetes Since a mild B12 deficiency might not cause symptoms, it can go undetected for years since levels are not checked during routine blood work