Methylcobalamin (B12) 0.9% Benzyl Alcohol Description

Methylcobalamin (mecobalamin, MeCbl) is one of the two naturally active coenzyme forms of vitamin B12 (cobalamin), alongside adenosylcobalamin. Structurally, it is an octahedral cobalt-centered corrin complex that differs from synthetic cyanocobalamin in that the cyano group bound to the central cobalt atom is replaced by a methyl group. This methyl group is biologically significant, as it is the form of B12 that the body uses directly in the cytosolic methylation cycle without requiring conversion.

Methylcobalamin functions primarily as the essential cofactor for methionine synthase (5-methyltetrahydrofolate-homocysteine methyltransferase), the enzyme that catalyzes the remethylation of homocysteine to methionine. This reaction sits at the convergence of the folate cycle and the methylation cycle, regenerating tetrahydrofolate and producing methionine — the precursor to S-adenosylmethionine (SAMe), the body’s universal methyl donor for DNA, protein, and lipid methylation reactions.

Because of its central role in homocysteine metabolism, myelin maintenance, and methylation-dependent processes, methylcobalamin has been extensively studied in research contexts ranging from peripheral nerve regeneration and neuroprotection to homocysteine regulation. It is noted in the literature for a relatively stronger affinity for nervous tissue compared to other cobalamin analogs.

Compound Information

Lyophilized Compounds:

This compound is freeze-dried, a process that not only extends shelf life but also preserves the purity and integrity of the compound during storage. We do not use any fillers in this process. Methylcobalamin is light-sensitive and should be protected from light during storage and handling.

Sealed Vial: Lyophilized Powder

CAS No.: 13422-55-4

Other Names: Mecobalamin, Methyl-B12, Vitamin B12 (methylcobalamin form)

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Methylcobalamin Research

The following sections explore the applications and mechanisms of Methylcobalamin across multiple research domains. As the active, methylation-cycle form of vitamin B12, methylcobalamin has been investigated for roles extending beyond basic nutritional sufficiency, with particular research interest in its neuroprotective and nerve-regenerative properties.

This overview synthesizes key findings on its cofactor mechanism, role in homocysteine metabolism, and experimental applications in peripheral nerve regeneration, myelination, and neuroprotective signaling.

Cofactor Mechanism and the Methylation Cycle

Methylcobalamin is the specific vitamin B12 form used by methionine synthase. In this role it serves as an intermediate methyl carrier, accepting a methyl group from 5-methyltetrahydrofolate and transferring it to homocysteine to form methionine. This step is essential for regenerating tetrahydrofolate (linking folate and B12 metabolism) and for producing SAMe, which drives the methylation reactions required for normal nervous system function.

A core research focus is methylcobalamin’s role in lowering homocysteine. Elevated homocysteine (hyperhomocysteinemia) is studied as an independent risk marker in vascular and neurological research, and methylcobalamin’s capacity to support its conversion to methionine is central to much of the literature on its mechanism.

Nerve Regeneration and Signaling Pathways

A significant body of preclinical research has examined methylcobalamin’s effects on peripheral nerve repair. A frequently cited study (Okada et al., 2010, Experimental Neurology) demonstrated that methylcobalamin increases the activity of the Erk1/2 and Akt signaling pathways through the methylation cycle and promotes nerve regeneration in a rat sciatic nerve injury model. These pro-survival and pro-regenerative cascades are mechanistically linked to neuronal survival, neurite outgrowth, and nerve conduction.

Additional in vivo work has reported methylcobalamin-associated nerve regeneration across multiple injury and neuropathy models, including streptozotocin-diabetic rats, acrylamide neuropathy models, and end-to-side neurorrhaphy studies in which systemic methylcobalamin enhanced donor-axon sprouting and recipient muscle innervation.

Myelination and Schwann Cell Research

Methylcobalamin has been studied for its role in myelin sheath synthesis and maintenance, which is critical to proper nerve conduction. Research published in Frontiers in Cellular Neuroscience reported that methylcobalamin promoted Schwann cell differentiation and increased myelin basic protein expression in vitro, and promoted remyelination alongside motor and sensory functional recovery in a focal demyelination rat model. Further work in models of ammonia-related neurotoxicity reported restoration of hippocampal myelination correlated with methionine synthase activity and homocysteine normalization.

Peripheral Neuropathy Research

Methylcobalamin has been investigated in clinical research on peripheral neuropathy, often as a component of combination formulations. Trials examining methylcobalamin — frequently combined with L-methylfolate and pyridoxal-5′-phosphate — in diabetic peripheral neuropathy have reported improvements in neuropathic symptom scores and associated reductions in plasma homocysteine, though outcomes on objective measures such as vibration perception threshold have varied across studies. The research literature characterizes methylcobalamin as generally well tolerated in these investigations.

Neuroprotection and Antioxidant Research

Beyond its cofactor role, methylcobalamin has been examined for direct neuroprotective and antioxidant properties, including studies exploring protection of neuronal cells against oxidative-stress-induced damage and its action on downstream mechanisms of nerve growth factor and brain-derived neurotrophic factor (BDNF). These pathways remain areas of ongoing investigation.