What It Is Vitamin B12 (methylcobalamin) is an essential nutrient that supports red blood cell formation, energy production, nervous system health, and metabolic function
Harris, I
Li R, Li Y, Zuo H, Pei G, Huang S, Hou Y
Medicine 99(43):e22916 Panahi Y, Kianpour P, Mohtashami R, Jafari R, Simental-Menda LE, Sahebkar A (2016Sep 1) Curcumin lowers serum lipids and uric acid in subjects with nonalcoholic fatty liver disease: a randomized controlled trial
Blood testing for B12 directly hasnt got a gold standard either Total/serum B12 contains both the active/useable fraction (holotranscobalamin) and the inactive fraction bound to a carrier (holohaptocorrin)