What it is & primary uses
A cobalt-containing vitamin required for neurologic function, DNA synthesis and red-blood-cell formation.
Main benefits
- Prevents deficiency and is essential for people without reliable dietary B12.
- Large oral amounts reflect limited absorption and do not prove an energy benefit in replete users.
Studied protocols
Research doses are grouped by outcome. They describe study designs—not a personal prescription.
2.4 mcg/day total intake for adults; supplements often use more
- Study duration
- Daily; deficiency treatment may require clinician-directed dosing and monitoring
- Interpretation
- Strong for nutritional adequacy; not evidence that high-dose supplementation improves outcomes in already-replete people.
04Food sources & equivalents＋
Can food provide a studied amount?
Meat, fish, eggs, dairy and fortified foods can provide related dietary exposure, but food and extract milligrams are not automatically interchangeable.
Dietary exposure; verify composition before comparing with a studied supplement dose
- How this was estimated
- Dose Radar compares the declared active ingredient with official composition data or the studied standardized extract—not with marketing names.
- Important limitation
- Natural content, preparation, bioavailability and formulation vary. This comparison does not prove equal physiological effect.
Food equivalents compare ingredient mass using published composition values. They do not prove equal absorption, formulation, physiological effect, safety or personal need.
Source: NIH ODS Vitamin B12 fact sheet ↗05How to take it for absorption & tolerance＋
With or without food
Human research has not established a universally superior fed or fasted protocol for this ingredient.
- Practical approach
- Any consistent time. Keep the formulation and daily total consistent with the evidence context shown above.
- Watch for
- Metformin and acid-suppressing medicines can affect status
Meal guidance reflects human pharmacokinetic, clinical, official-label or evidence-review sources where available. A food pairing can change absorption or tolerability, but does not make a supplement necessary, effective or safe for every person.
Source: NIH ODS Vitamin B12 fact sheet ↗06Supplement interaction check＋
An unlisted pair means no established pair-specific interaction was identified in this review—not proof that every dose, product or person is safe.
This is not proof that every dose, product or user context is safe. Medication and condition checks still apply.
07Research notes＋
Strong evidence for the stated context. Strong for nutritional adequacy; not evidence that high-dose supplementation improves outcomes in already-replete people.
The strongest use is meeting a physiological requirement or correcting documented inadequacy. More than needed does not create a proportional benefit.
08Scientific references＋
Peer-reviewed human research and formal evidence reviews. Open each source to inspect the complete paper record.
NIH ODS Vitamin B12 fact sheet
Dose context: 2.4 mcg/day total intake for adults; supplements often use more
Defines physiological roles, intake targets, upper limits, deficiency contexts and major safety considerations.
Vitamin B12: live PubMed review search
Dose context: Ingredient-specific human literature; dose and formulation vary
This live index supports source verification. A new paper does not change the Dose Radar grade until its design, population and formulation are reviewed.
09Expert & media references＋
Podcast and practitioner statements are clearly separated from research. They may explain practice or emerging ideas, but do not prove efficacy.
Dose Radar will leave this lane empty rather than invent or infer a professional opinion.