{"publisher":"B12 Shot Rx","product":"Vitamin B12 injection","preparedAt":"2026-11-07","reviewStatus":"Research drafts; medical review has not been claimed","facts":[{"label":"Research finding 1","text":"A systematic review and meta-analysis states that vitamin B12 is often used to improve cognitive function, depressive symptoms, and fatigue, that in most cases such complaints are not associated with overt vitamin B12 deficiency or advanced neurological disorders, and that the effectiveness of vitamin B12 supplementation in such cases is uncertain.","href":"https://pubmed.ncbi.nlm.nih.gov/33809274/"},{"label":"Research finding 2","text":"A randomized placebo-controlled trial in 95 IBS and IBD patients with deactivating fatigue and normal vitamin B12 blood levels gave 1000 μg vitamin B12 daily or placebo for 8 weeks, and the authors concluded that the study did not confirm the expected effect of non-conventional surplus vit B12 supplementation on fatigue.","href":"https://pubmed.ncbi.nlm.nih.gov/29460813/"},{"label":"Research finding 3","text":"A trial in thirty-one young Burmese men assessed physical performance capacity before and after injection of cyanocobalamin and a placebo, and found no significant difference between the 1 mg cyanocobalamin and placebo groups in any of the criteria measured.","href":"https://pubmed.ncbi.nlm.nih.gov/698165/"},{"label":"Research finding 4","text":"A randomized placebo-controlled trial of methylcobalamin 1000 μg daily for 27 months in 271 diabetic outpatients aged 70 years or older with borderline vitamin B12 status concluded that vitamin B12 supplementation did not prevent cognitive decline.","href":"https://pubmed.ncbi.nlm.nih.gov/27823800/"},{"label":"Research finding 5","text":"A Cochrane review of oral versus intramuscular vitamin B12 for deficiency concluded that low quality evidence shows oral and IM vitamin B12 having similar effects in terms of normalising serum vitamin B12 levels, but oral treatment costs less, and it states that no trial reported on clinical signs and symptoms of vitamin B12 deficiency.","href":"https://pubmed.ncbi.nlm.nih.gov/29543316/"},{"label":"Research finding 6","text":"A scoping review of human studies concluded there is not sufficient evidence to assume that high plasma vitamin B12, high B12 intake, or treatment with pharmacological doses of vitamin B12, is causally related to cancer; a population-based observational cohort study found high cobalamin levels associated with the risk of subsequently diagnosed cancer.","href":"https://pubmed.ncbi.nlm.nih.gov/36364737/"},{"label":"Research finding 7","text":"FDA states that compounded drugs are not FDA-approved, which means that FDA does not verify the safety, effectiveness or quality of compounded drugs before they are marketed.","href":"https://www.fda.gov/drugs/human-drug-compounding/compounding-and-fda-questions-and-answers"}],"sources":[{"title":"Cyanocobalamin injection prescribing information","href":"https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=54f088b1-7cf8-3837-e063-6294a90a88e7"},{"title":"NHLBI: vitamin B12 deficiency anemia","href":"https://www.nhlbi.nih.gov/health/anemia/vitamin-b12-deficiency-anemia"},{"title":"Drugs@FDA: cyanocobalamin injection application overview","href":"https://www.accessdata.fda.gov/scripts/cder/daf/index.cfm?event=overview.process&ApplNo=080515"},{"title":"FDA: understanding unapproved use of approved drugs (off label)","href":"https://www.fda.gov/patients/learn-about-expanded-access-and-other-treatment-options/understanding-unapproved-use-approved-drugs-label"},{"title":"FDA: compounding and FDA questions and answers","href":"https://www.fda.gov/drugs/human-drug-compounding/compounding-and-fda-questions-and-answers"},{"title":"Cochrane review: oral versus intramuscular vitamin B12","href":"https://pubmed.ncbi.nlm.nih.gov/29543316/"}],"guides":[{"title":"B12 and performance, neuropathy, cognition and heart outcomes","url":"https://b12shotrx.com/research-guides/b12-and-performance-neuropathy-cognition-and-heart-outcomes","description":"What a performance trial, Cochrane reviews and a methylcobalamin trial report on B12, nerves, cognition and heart outcomes.","date":"2026-11-10"},{"title":"B12 for energy and fatigue: what trials measured","url":"https://b12shotrx.com/research-guides/b12-for-energy-and-fatigue-what-trials-measured","description":"What reviews and trials in people with and without a B12 deficiency measured for fatigue, mood and wellbeing, including null results.","date":"2026-11-10"},{"title":"What the B12 injection label says about route, monitoring and diet","url":"https://b12shotrx.com/research-guides/b12-injection-label-routes-monitoring-and-diet-statements","description":"A summary of cyanocobalamin injection label statements on route, tests, potassium, allergy and interactions, for the approved product only.","date":"2026-11-10"},{"title":"B12 injection label warnings: what the label says","url":"https://b12shotrx.com/research-guides/b12-injection-label-warnings-what-the-label-says","description":"What the prescribing information for cyanocobalamin injection says in its contraindication and warnings, and who each statement is about.","date":"2026-11-10"},{"title":"B12 injection side effects and when to call a provider","url":"https://b12shotrx.com/research-guides/b12-injection-side-effects-and-when-to-call-a-provider","description":"Adverse reactions the label lists, other label statements, and what a MedlinePlus page says about anaphylaxis and calling 911.","date":"2026-11-10"},{"title":"B12 in pregnancy, breastfeeding and childhood: what sources say","url":"https://b12shotrx.com/research-guides/b12-pregnancy-breastfeeding-and-children-what-sources-say","description":"What the cyanocobalamin injection label, the NHLBI and a Cochrane review say about B12 in pregnancy, nursing and children.","date":"2026-11-10"},{"title":"High B12 levels and cancer: what observational studies found","url":"https://b12shotrx.com/research-guides/high-b12-levels-and-cancer-what-observational-studies-found","description":"What studies and reviews report about high B12 levels and supplement use, and what each source did and did not measure.","date":"2026-11-10"},{"title":"Injection versus oral B12: what trials and reviews found","url":"https://b12shotrx.com/research-guides/injection-versus-oral-b12-what-trials-and-reviews-found","description":"What a Cochrane review, four randomized trials and other reviews report on oral versus injected B12 in people with deficiency, and their limits.","date":"2026-11-10"},{"title":"Untreated B12 deficiency and folic acid: what sources say","url":"https://b12shotrx.com/research-guides/untreated-b12-deficiency-and-folic-acid-what-sources-say","description":"What the label and NHLBI say about untreated B12 deficiency, and how the label and a historical review differ on folic acid.","date":"2026-11-10"},{"title":"What a compounded B12 injection means, according to FDA pages and reviews","url":"https://b12shotrx.com/research-guides/what-a-compounded-b12-injection-means","description":"What FDA pages and reviews say about compounded drugs, and that no source here tests the content or sterility of any compounded B12 product.","date":"2026-11-10"},{"title":"What a vitamin B12 injection is and what the label says","url":"https://b12shotrx.com/research-guides/what-a-vitamin-b12-injection-is-and-what-the-label-says","description":"A plain summary of what the cyanocobalamin injection label says about the product, its listed indications and oral supplementation.","date":"2026-11-10"},{"title":"Who is at risk of low B12, and how is deficiency diagnosed?","url":"https://b12shotrx.com/research-guides/who-is-at-risk-of-low-b12-and-how-deficiency-is-diagnosed","description":"What guidelines, reviews and patient pages say about B12 deficiency risk groups, tests and drugs, with each source's group and limits.","date":"2026-11-10"}]}