Methylcobalamin
Vitamin ·Exploratory record · not publication-reviewed ·Updated July 13, 2026
The active, methylated coenzyme form of vitamin B12, bypasses conversion steps.
Exploratory record, not a reviewed medical publication.
See the editorial and medical-review policies for the publication gate.
This generated database record has not completed a claim-level review by a qualified human medical reviewer. Bibliography links and evidence labels are not approval. The page remains available for reference and is excluded from search indexing.
What the research says.
A quick, data-only summary. The full evidence, dosing, and sources are below.
Methylcobalamin is a vitamin most often used for methylation support, nerve health, energy. NutriStack rates the overall evidence as strong. A typical adult dose is 1,000-5,000 mcg sublingual daily, commonly taken as sublingual methylcobalamin (bypasses gi absorption issues). This profile indexes 17 sources.
The bottom line
Evidence rating strong. Most-documented uses: methylation support, nerve health, energy. 17 sources indexed (1994–2026), with 0 interaction records on file.
How it works, mechanistically.
Core mechanism
Direct methyl donor for methionine synthase in the cytoplasm. Does not require reduction/methylation like cyanocobalamin. Critical for myelin synthesis and methylation.1,2
Dosing & protocol.
What it actually costs.
Real-world pricing across three quality tiers. Assumes Methylcobalamin.
Assumes about 1,000 mcg/day. Active B12 is still relatively cheap, but sublingual tablets and premium methylation blends move it above plain cyanocobalamin. Updated 2026-04-02.
The same dose, as food.
How much you'd eat to match a supplemental dose.
Foods supply microgram-level B12; high-dose methylcobalamin supplements are used for absorption reliability.
Full safety detail.
Side effects
- Very well tolerated
- Pink urine (harmless)
Contraindications
- Leber's disease
Sources, by evidence tier.
Numbered references. Citations throughout the page link here.
Meta-analyses & systematic reviews
8- 1Dapagliflozin combined with methylcobalamin in the treatment of type 2 diabetes mellitus with peripheral neuropathy: a systematic review and meta-analysisPMIDDeng XL, Wu R, Lin XX et al. · Frontiers in endocrinology · 2025
Deng XL, Wu R, Lin XX et al.. Dapagliflozin combined with methylcobalamin in the treatment of type 2 diabetes mellitus with peripheral neuropathy: a systematic review and meta-analysis. Frontiers in endocrinology. 2025
- 2Is acupoint injection the optimal way to administer mecobalamin for diabetic peripheral neuropathy? A meta-analysis and trial sequential analysisPMIDZhang F, Yu Y, Yin S et al. · Frontiers in neurology · 2023
Zhang F, Yu Y, Yin S et al.. Is acupoint injection the optimal way to administer mecobalamin for diabetic peripheral neuropathy? A meta-analysis and trial sequential analysis. Frontiers in neurology. 2023
- 3Efficacy and safety of mecobalamin combined with vestibular rehabilitation training for acute vestibular neuritis: a systematic review and meta-analysisPMIDSun X, Li X, Yang D · Annals of palliative medicine · 2022
Sun X, Li X, Yang D. Efficacy and safety of mecobalamin combined with vestibular rehabilitation training for acute vestibular neuritis: a systematic review and meta-analysis. Annals of palliative medicine. 2022
- 4Efficacy and safety of traditional Chinese medicine injection with mecobalamin in treating diabetic peripheral neuropathy: A protocol for systematic review and meta-analysisPMIDMai W, Wei A, Lin X et al. · Medicine · 2021
Mai W, Wei A, Lin X et al.. Efficacy and safety of traditional Chinese medicine injection with mecobalamin in treating diabetic peripheral neuropathy: A protocol for systematic review and meta-analysis. Medicine. 2021
- 5Efficacy and Safety of Mecobalamin Combined with Prokinetic Agents in the Treatment of Diabetic Gastroparesis: A Meta-AnalysisPMIDYao J, Peng B, Gong X et al. · Iranian journal of public health · 2021
Yao J, Peng B, Gong X et al.. Efficacy and Safety of Mecobalamin Combined with Prokinetic Agents in the Treatment of Diabetic Gastroparesis: A Meta-Analysis. Iranian journal of public health. 2021
- 6Effects of Vitamin B12 Supplementation on Cognitive Function, Depressive Symptoms, and Fatigue: A Systematic Review, Meta-Analysis, and Meta-RegressionSource linkedPMIDMarkun S, Gravestock I, Jager L, Rosemann T, Pichierri G, Burgstaller JM · Nutrients · 2021
- 7Efficacy and Safety of Mecobalamin on Peripheral Neuropathy: A Systematic Review and Meta-Analysis of Randomized Controlled TrialsPMIDZhang M et al. · Front Pharmacol · 2020
Mecobalamin in combination is effective in improving clinical therapeutic efficacy and nerve conduction velocity for peripheral neuropathy; no serious adverse events reported.
- 8Combined therapy of diabetic peripheral neuropathy with breviscapine and mecobalamin: a systematic review and a meta-analysis of Chinese studiesPMIDZheng C, Ou W, Shen H et al. · BioMed research international · 2015
Zheng C, Ou W, Shen H et al.. Combined therapy of diabetic peripheral neuropathy with breviscapine and mecobalamin: a systematic review and a meta-analysis of Chinese studies. BioMed research international. 2015
Randomized controlled trials
3- 9Clinical safety of ultra-high-dose methylcobalamin in patients with amyotrophic lateral sclerosis: Open-label extension of a phase 2/3 randomized controlled studyPMIDKaji R, Nishi Y, Ishida T et al. · Journal of the neurological sciences · 2026
Kaji R, Nishi Y, Ishida T et al.. Clinical safety of ultra-high-dose methylcobalamin in patients with amyotrophic lateral sclerosis: Open-label extension of a phase 2/3 randomized controlled study. Journal of the neurological sciences. 2026
- 10Vitamin B12 Supplementation in Diabetic Neuropathy: A 1-Year, Randomized, Double-Blind, Placebo-Controlled TrialPMIDDidangelos T et al. · Nutrients · 2021
Oral methylcobalamin (1 mg) for twelve months improved nerve conduction, sudomotor function, pain score, and quality of life in diabetic neuropathy.
- 11Sublingual methylcobalamin treatment is as effective as intramuscular and peroral cyanocobalamin in children age 0-3 yearsPMIDYilmaz S et al. · J Pediatr Hematol Oncol · 2021
Sublingual methylcobalamin was as effective as oral and intramuscular cyanocobalamin in improving vitamin B12 levels in children, supporting sublingual delivery route.
Reviews & position papers
3- 12B12 as a Treatment for Peripheral Neuropathic Pain: A Systematic ReviewPMIDSuh JH et al. · Nutrients · 2020
Level II evidence supports B12 for post-herpetic neuralgia and level III evidence for painful peripheral neuropathy treatment.
- 13Comparative Bioavailability and Utilization of Particular Forms of B12 Supplements With Potential to Mitigate B12-related Genetic PolymorphismsPMIDPaul C et al. · Integr Med (Encinitas) · 2017
All supplemental B12 forms are reduced to core cobalamin then converted to active methylcobalamin and adenosylcobalamin intracellularly; bioavailability may be influenced by genetics.
- 14Treatment of vitamin B12 deficiency-methylcobalamine? Cyancobalamine? Hydroxocobalamin?-clearing the confusionPMIDPaul C et al. · Eur J Clin Nutr · 2015
Three natural forms of vitamin B12 (methylcobalamin, adenosylcobalamin, hydroxocobalamin) are bioidentical to forms in human physiology; cyanocobalamin is synthetic requiring conversion steps.
Mechanistic & preclinical
1- 15Ultra-high dose methylcobalamin promotes nerve regeneration in experimental acrylamide neuropathySource linkedPMIDWatanabe T, Kaji R, Oka N et al. · J Neurol Sci · 1994
Reference material
2- 16Lee CW, Jin JS, Kwon S et al.. Are herbal medicines alone or in combination for diabetic peripheral neuropathy more effective than methylcobalamin alone? A systematic review and meta-analysis. Complementary therapies in clinical practice. 2022Source linkedPMID
- 17Deng H, Yin J, Zhang J et al.. Meta-analysis of methylcobalamin alone and in combination with prostaglandin E1 in the treatment of diabetic peripheral neuropathy. Endocrine. 2014Source linkedPMID
Common questions.
Quick answers about Methylcobalamin, drawn from the data on this page.
What is Methylcobalamin?
The active, methylated coenzyme form of vitamin B12, bypasses conversion steps.
What is Methylcobalamin used for?
Commonly cited benefits of Methylcobalamin include: Methylation support; Nerve health; Energy; MTHFR support. NutriStack rates the overall evidence as strong.
What is a typical dose of Methylcobalamin?
A typical adult dose of Methylcobalamin is 1,000-5,000 mcg sublingual daily. The commonly recommended form is Sublingual methylcobalamin (bypasses GI absorption issues). These are general ranges, not personalized advice; confirm the right dose with a clinician.
What are the side effects of Methylcobalamin?
Reported side effects include very well tolerated, pink urine (harmless). This is educational information; check with a healthcare professional before use.
How strong is the evidence for Methylcobalamin?
NutriStack rates this as Strong, meaning multiple high-quality meta-analyses or systematic reviews converge on the same finding. Full tier criteria are at https://nutristackapp.com/methodology/evidence-tiers.
Use this with your stack
Methylcobalamin in NutriStack.
Add it to your stack, see how it interacts with everything else you take, and get a Stack Score that updates the moment it does.