Vitamin B12: what the evidence actually shows

Reviewed by Substrate editorial, Independent research collective · 2026-07-16

Evidence by outcome

energy / fatiguegrade Clow certainty— corrects fatigue when B12 deficiency is present; no energy benefit in replete people

People say · Evidence shows

“B12 shots give you energy”

aheadlargemarketing claim

Grade history

2026-07-16C → CCorrection by Claude (gold-standard provenance sweep): live Postgres source drift replaced with the verified seed source set [pmid-33809274] details →

Re-review cadence: every 6 months (Grade C+) · next scheduled by 2027-01-16 · methodology v1.

By outcome — the money pages

Vitamin B12 for energy / fatigue — Grade C, low certainty

Compare

Is Vitamin B12 hype?

sources: PMID:33809274

Cite this page

Reuse under CC-BY 4.0 with attribution to evidencebased.info.

Plain-text citation

Substrate. Vitamin B12: what the evidence actually shows. https://evidencebased.info/interventions/b12. Updated 2026-07-16.

BibTeX

@misc{substrate_infointerventionsb12,
  author = {Substrate editorial},
  title  = {Vitamin B12: what the evidence actually shows},
  year   = {2026},
  url    = {https://evidencebased.info/interventions/b12},
  note   = {evidencebased.info}
}