B12

Vitamin B12 — Cobalamin Methylation Cofactor Research Compound

Vitamin B12 (cobalamin) is a cobalt-centered water-soluble vitamin that serves as an essential cofactor for two human enzymes: methionine synthase (cytosolic, methylation cycle) and methylmalonyl-CoA mutase (mitochondrial, odd-chain fatty acid metabolism). Dietary B12 is absorbed in the terminal ileum via intrinsic-factor-dependent transport and is one of the few vitamins whose deficiency produces distinct hematologic (megaloblastic anemia) and neurologic (subacute combined degeneration) phenotypes. In research, B12 is the reference methionine-synthase cofactor and the foundational member of the B-vitamin / one-carbon metabolism toolkit.

Why the Cobalt Center and Dual-Enzyme Role Matter

B12’s research significance comes from the two reactions it catalyzes. As methylcobalamin, it is required for methionine synthase, which regenerates methionine from homocysteine – the entry point to the SAM (S-adenosylmethionine) methylation cycle. As adenosylcobalamin, it is required for methylmalonyl-CoA mutase, which converts methylmalonyl-CoA to succinyl-CoA during odd-chain fatty acid and branched-chain amino acid metabolism. Deficiency in either reaction produces distinct measurable biomarkers (elevated homocysteine for methionine synthase, elevated methylmalonic acid for the mutase) – which is why these are the reference B12-status markers in hematology research.

Methylcobalamin vs Cyanocobalamin vs Hydroxocobalamin

B12 exists in several interconvertible forms that differ in what is bound to the cobalt center. The research literature compares them frequently.

Applicazioni di ricerca

Vitamin B12 is used in studies examining:

• Methionine synthase and SAM-cycle methyl-group transfer endpoints
• Homocysteine and methylmalonic acid biomarker research
• Megaloblastic anemia and hematopoiesis models
• B-vitamin cofactor and one-carbon metabolism research
• Pernicious anemia and intrinsic-factor-deficient absorption models
• Comparative cobalamin form research (methyl-, cyano-, hydroxo-, adenosylcobalamin)

Specifiche tecniche

Manipolazione

Vitamin B12 ships as a pre-mixed sterile solution rather than as a lyophilized powder. No reconstitution is required. Store at 2-8°C, protect from light (cobalamin is light-sensitive and develops a characteristic ruby-red color that fades under light exposure), and use within the expiration window on the vial.

Note sul protocollo

The following values are reference points extracted from published B12 research – not instructions. Published protocols vary widely by indication – repletion of deficiency uses different schedules than maintenance or research dosing.

• Dose range reported in the literature: 100-1000mcg per administration (repletion protocols use the upper end of this range)
• Administration frequency in published studies: Daily loading for deficiency repletion; weekly to monthly for maintenance
• Study durations reported: 4-12 weeks for hematologic endpoint studies

Common Questions About B12 Research

What is B12 used for in research?

It is studied as the reference cobalamin cofactor for methionine synthase and methylmalonyl-CoA mutase. Published work covers SAM-cycle methyl-group transfer, homocysteine and methylmalonic acid biomarker research, megaloblastic anemia models, one-carbon metabolism, and comparative cobalamin-form research.

Is B12 a peptide?

No. Vitamin B12 is a cobalt-centered coenzyme built around a corrin ring – it is not a peptide. It appears in the research-compound toolkit because its cofactor role in the methionine / SAM cycle overlaps directly with peptide-adjacent one-carbon metabolism and Lipo-C / MIC research.

What is the difference between methylcobalamin and cyanocobalamin?

Methylcobalamin is one of the active coenzyme forms of B12 – it is used directly by methionine synthase in the cytosol. Cyanocobalamin is a synthetic stable form with a cyanide group on the cobalt center; the body cleaves the cyanide and reduces it to active methyl- or adenosylcobalamin in vivo. Cyanocobalamin is the most economical form and is the reference form in most historical B12 research; methylcobalamin is preferred in research that requires direct active-form delivery.

Is B12 FDA approved?

Vitamin B12 (as cyanocobalamin and hydroxocobalamin injection) is FDA approved for pernicious anemia and vitamin B12 deficiency. Research-grade B12 is not sold under those approved-drug brand labels and is distinct from the approved drug products. Every vial WWP ships is labeled and sold strictly for laboratory and research use only.

How is B12 stored?

B12 ships as a pre-mixed sterile solution. Store at 2-8°C, protect from light, and use within the expiration window printed on the vial.

Garanzia di purezza

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