Vitamin B12 Methylcobalamin
People mainly take Vitamin B12 Methylcobalamin for focus, memory, mood. Based on 3 first-hand reports and 0 meta-analyses & systematic reviews in the medical literature. Ranked #1619 of 1,974 overall.
Of reports that state an outcome, 0% are positive.
What Vitamin B12 Methylcobalamin 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.
1–4 randomized controlled trials, no meta-analysis yet. The grade measures how much human research exists — read the conclusions below for what it found.
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.
“I took 1000 mcg B12 for five days...since I have not felt right. I have increased anhedonia, depression, apathy, loss of emotions, cognitive decline”
“Vitamin B12 (Methylcobalamin): 1mg, 1x a week”
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