Vitamin B12 (cobalamin)

Research records

Historical source snapshot. Not freshly verified, not a recommendation. Study findings, community accounts and app defaults are not interchangeable.

Publication suitability · 2026-10-15: Historical reference only; not a clinical verification. Clinical, regulatory, efficacy, safety and dose claims are not independently established by this review.

Vitamin B12 (cobalamin)

Water-soluble vitamin. Methylcobalamin and cyanocobalamin are the common forms.

Evidence category: Reference only. This describes the source category, not approval or certainty.

Regulatory statement in source: Not separately recorded; do not infer approval from the evidence category.

Vitamin B12 (cobalamin) is an essential water-soluble vitamin, and the NIH fact sheets are general references on its forms, absorption and deficiency. Absorption of food-bound B12 depends on intrinsic factor in the stomach. A short journal commentary argues that methylcobalamin alone is incomplete because adenosylcobalamin has separate metabolic roles, and reports that oral treatment corrects deficiency as well as intramuscular injection. No trial data is linked, so this is reference-level material.

Benefits reported in the imported source

• An essential vitamin; NIH fact sheets cover its forms, absorption and deficiency
• A commentary reports oral treatment corrects deficiency as well as injection

Risks and limits

• No trial data is linked here, so this is reference-level material only
• Absorption of food-bound B12 depends on intrinsic factor in the stomach
• One commentary argues methylcobalamin alone is incomplete, since adenosylcobalamin has separate roles

Source bottom line: An essential vitamin described here from reference sources; oral treatment reportedly matches injection.

Uncertainty: Reference information only. Not medical advice.

Study protocols — reports, not instructions

No study protocol recorded in this snapshot. This does not establish that no study exists.

Community and practice descriptions

Accounts of a practice are not evidence of safety or effectiveness. Words such as “standard”, “safe” or “recommended” describe the source account, not verified consensus or this wiki’s advice. Commercial and self-published citations are retained for traceability, not vendor endorsement or independent clinical corroboration.

Pharmacokinetic context

No half-life recorded in this source snapshot. No value has been inferred.

Source references

• Vitamin B12 - Consumer (Office of Dietary Supplements) (availability check 2026-10-15: source not retrieved; HTTP 403)
• Vitamin B12 - Health Professional Fact Sheet (availability check 2026-10-15: source not retrieved; HTTP 403)
• Treatment of vitamin B12 deficiency-methylcobalamine? Cyancobalamine? Hydroxocobalamin?-clearing the confusion (Thakkar 2015)
• NIH ODS: Vitamin B12 (availability check 2026-10-15: source not retrieved; HTTP 403)