The variance is typically within acceptable experimental error margins
An expert reveals the 6 best vitamin B12 supplements you should take in 2026 These are the best B12 supplements on the market, according to a nutritional therapist Bookmark Vitamin B12 plays an important role in keeping your body functioning properly, although it's often overlooked

Conditions associated with elevated B12 levels include: Liver disease : Hepatocellular damage releases stored B12 into circulation, with levels correlating with disease severity in conditions such as cirrhosis, hepatitis, and hepatocellular carcinoma Renal impairment : Reduced kidney function decreases B12 clearance, leading to accumulation Haematological malignancies : Myeloproliferative disorders, acute leukaemia, and polycythaemia vera can elevate B12 through increased production of B12-binding proteins (transcobalamins) Solid tumours : Certain cancers, particularly those affecting the liver or gastrointestinal tract, may elevate B12 levels A specific concern relates to cyanocobalamin in patients with Leber's hereditary optic neuropathy , a rare mitochondrial disorder
Rictor/mTORC2 loss in the Myf5 lineage reprograms brown fat metabolism and protects mice against obesity and metabolic disease
Shoulder - make a downward-facing triangle over the deltoid muscle on the upper arm with the thumb and forefinger of the non-injection hand