Conclusion: Oral vitamin B12 supplementation during pregnancy may reduce the risk of maternal vitamin B12 deficiency and may improve maternal vitamin B12 concentrations during pregnancy or postpartum compared to placebo or no vitamin B12 supplementation, but the evidence is very uncertain. The effects of vitamin B12 supplementation on other primary outcomes assessed in this review were not reported, or were not reported in a format for inclusion in quantitative analyses. Vitamin B12 supplementation during pregnancy may improve maternal and infant vitamin B12 status, but the potential impact on longer-term
PubMed 38189492 ↗Methylated B12
People mainly take Methylated B12 for focus, energy, anxiety. Based on 6 first-hand reports and 21 meta-analyses & systematic reviews in the medical literature. Ranked #1219 of 1,974 overall.
Of reports that state an outcome, 50% are positive.
What Methylated B12 does, according to users
Of the people who reported each effect, the share who said it got better.
What the research says
Systematic reviews and meta-analyses from PubMed, with their published conclusions.
At least one meta-analysis, or 5+ randomized controlled trials. The grade measures how much human research exists — read the conclusions below for what it found.
Conclusion: Our findings suggest that DNAm might be a promising molecular strategy for understanding sex differences in the pathophysiology of cardiometabolic diseases and that future studies should investigate the effects of sex on epigenetic mechanisms in cardiometabolic risk. In addition, we emphasize the gap between the translational potential and the clinical utilization of cardiometabolic epigenetics.
PubMed 32252966 ↗Conclusion: There is little evidence to support the use of nutritional supplements or dietary therapies for children with ASD.
PubMed 28562286 ↗Conclusion: This review found no evidence for short-term benefit from vitamin B6 in improving mood (depression, fatigue and tension symptoms) or cognitive functions. For the older people included in one of the two trials included in the review, oral vitamin B6 supplements improved biochemical indices of vitamin B6 status, but potential effects on blood homocysteine levels were not assessed in either study. This review found evidence that there is scope for increasing some biochemical indices of vitamin B6 status among older people. More randomized controlled trials are needed to explore possible benefits
PubMed 14584010 ↗Dosage people report
As stated by users — not a recommendation. Follow the label or your doctor.
Reported side effects
How often each side effect came up across all reports.
What users say
Verbatim quotes, shortened only — each links to the original discussion.
“It's probably the methyl b12 and/or the methylated folate”
“1000 mcg b12 (methylcobalamin)”
“The methylated versions *instantly* cleared up brain fog and fatigue that I've battled with my whole life.”
“It could be you have the MTHFR gene mutation (which can cause insomnia) and the methylfolate and methylated B12 is having a corrective effect.”
“extremely high doses of methylb12 and methylfolate. I've been in a constant state of fight or flight and anxiety for months”
Other options for focus
User data from public discussions; research from PubMed. Information only, not medical advice — talk to a doctor before starting, stopping or combining anything. Data updated October 2, 2026. How we rate