Research library
Vitamin B12 injection, explained
12 guides, organized by the question you are trying to answer.
Research Guides
B12 and performance, neuropathy, cognition and heart outcomes
What a performance trial, Cochrane reviews and a methylcobalamin trial report on B12, nerves, cognition and heart outcomes.
B12 for energy and fatigue: what trials measured
What reviews and trials in people with and without a B12 deficiency measured for fatigue, mood and wellbeing, including null results.
What the B12 injection label says about route, monitoring and diet
A summary of cyanocobalamin injection label statements on route, tests, potassium, allergy and interactions, for the approved product only.
B12 injection label warnings: what the label says
What the prescribing information for cyanocobalamin injection says in its contraindication and warnings, and who each statement is about.
B12 injection side effects and when to call a provider
Adverse reactions the label lists, other label statements, and what a MedlinePlus page says about anaphylaxis and calling 911.
B12 in pregnancy, breastfeeding and childhood: what sources say
What the cyanocobalamin injection label, the NHLBI and a Cochrane review say about B12 in pregnancy, nursing and children.
High B12 levels and cancer: what observational studies found
What studies and reviews report about high B12 levels and supplement use, and what each source did and did not measure.
Injection versus oral B12: what trials and reviews found
What a Cochrane review, four randomized trials and other reviews report on oral versus injected B12 in people with deficiency, and their limits.
Untreated B12 deficiency and folic acid: what sources say
What the label and NHLBI say about untreated B12 deficiency, and how the label and a historical review differ on folic acid.
What a compounded B12 injection means, according to FDA pages and reviews
What FDA pages and reviews say about compounded drugs, and that no source here tests the content or sterility of any compounded B12 product.
What a Vitamin B12 injection is and what the label says
A plain summary of what the cyanocobalamin injection label says about the product, its listed indications and oral supplementation.
Who is at risk of low B12, and how is deficiency diagnosed?
What guidelines, reviews and patient pages say about B12 deficiency risk groups, tests and drugs, with each source's group and limits.
