OnePin Peptide Library · Metabolic
Methylcobalamin
Methyl B12 · Methyl-B12 · Methyl Vitamin B12
Methylcobalamin is the methylated, bioactive form of vitamin B12 - one of two coenzyme forms (the other being adenosylcobalamin). Distinct from cyanocobalamin (synthetic form requiring conversion) and hydroxocobalamin (intermediate form). Methylcobalamin is the form used in methionine synthase to convert homocysteine to methionine - a critical methylation cycle reaction.
Morning preferred.
Start here. Every protocol below is ordered lowest-first. Begin at the smallest effective dose, hold about a week to assess tolerance, and step up only if needed.
How it works
Methylcobalamin functions as direct B12 coenzyme:
Methionine Synthase Cofactor
Methylcobalamin is the active form for the methionine synthase reaction (homocysteine + 5-MTHF → methionine + tetrahydrofolate). Critical methylation cycle hub.
Direct Bioactive Form
Skips the conversion step required for cyanocobalamin (which must release cyanide and be re-methylated).
Neurological Function
Required for myelin synthesis, peripheral nerve function, and cognitive function.
Hematopoiesis
B12 is required for DNA synthesis - hence the megaloblastic anemia of B12 deficiency.
Cyanocobalamin Comparison
Methylcobalamin is theoretically preferred for users with neurological symptoms; clinical comparisons show modest advantage at higher doses.
What to expect
Days 1-14: energy effects in deficient users.
Weeks 2-4: peak effects.
Long-term: sustained methylation/nerve support.
Evidence
Interactions & stacking
What's safe to combine, and what belongs in a separate pin.
Keep separate
Side effects & safety
Commonly reported
- Generally well-tolerated
- Mild rosacea-like flush rare
Less common & notes
- Allergic reactions to cobalt rare.
- Long-term safety excellent (water-soluble vitamin).
Pharmacokinetics
Storage. Tablet/lozenge/liquid. Cool dry location, light-sensitive.
Regulatory status
Dietary supplement (US, DSHEA). Pharmaceutical injectable (cyano/hydroxocobalamin) for severe deficiency.
Put it to work
Calculate, log & track
Open Methylcobalamin straight into OnePin with your vial and dose pre-filled, then let it handle the syringe math and remind you before the vial runs out.
Open Methylcobalamin in the app →Go deeper
The guide & community
The complete Methylcobalamin walkthrough, real protocol discussion and coaching live inside the BlessUp community on Skool.
Join the community ↗