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Metabolic pathways: B12 is a cofactor in two critical reactions: Methylmalonyl-CoA mutase: Converts methylmalonyl CoA (from odd-chain fatty acids and some amino acids) into succinyl-CoA, which enters the Krebs (TCA) cycle to make ATP (cellular energy)
If you are genuinely low in B12, some people notice more energy within a few days, while correcting nerve symptoms or anemia takes longer
Am J Clin Nutr 108:612
Med ., 22 , 916
Vitamin B12 (1,000-5,000 mcg per mL): either cyanocobalamin (synthetic, stable form) or methylcobalamin (active form)
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