Vitamin B12 1000mcg.

The gap this formula speaks to.

Public health figures the engine matched to this formula's ingredients. Reported by their source, cited and dated, never written by the brand.

Population figures from public health data. Context for the category, not a statement about any individual and not a claim about this product.

Every one of these is a fact the engine could ground.

Each line below was derived from this formula's own record at the time of verification. Nothing here was written by the brand, and nothing can be added that the evidence does not carry.

• Studied in people17 human studies on Vitamin B12 back this formula, each one cited.
• A mechanism that is settledHow Vitamin B12 works is settled pharmacology.
• Recent work on the recordThe most recent study on this record was published in 2025.
• Serving amount inside the studied rangeEach serving carries 1,000 mcg of Vitamin B12, inside the range the published research used.
• A stated daily maintenance amountVitamin B12 is here at a daily maintenance amount, which is what a daily supplement is for.
• Why this formatIt arrives as a finished, measured serving, so there is nothing to weigh or mix before you take it.
• The exact form, describedThe form on the label is Cyanocobalamin. The record says what that form is and what it suits.
• Full label disclosureEvery ingredient on this label carries its own declared amount.
• Where it comes from and how it is madeVitamin B12 is made by fermentation.
• Positions this formula already qualifies forThis formula already qualifies for positions beyond the one it is sold into, on the evidence it carries.
• A position nobody is holding yetSome of those positions are ones almost nobody is selling to yet.

The size of the effect, in plain numbers.

Where a trial measured an actual number, we show it next to the claim. It is the average across the trials, never a promise about one person.

What the trials show about timing.

Time-to-effect windows the engine read from the trial record. Each is a window a named study measured, cited and dated, never written by the brand.

• Vitamin B12about 16 weeks of daily oral useBuilds with daily use

  A randomised, double-blind, parallel-group dose-finding trial in 120 older people with mild vitamin B12 deficiency, defined as serum B12 of 100 to 300 pmol/L with methylmalonic acid at or above 0.26 umol/L, gave daily oral cyanocobalamin at 2.5, 100, 250, 500 or 1000 ug for 16 weeks. Mean plasma methylmalonic acid fell 16%, 16%, 23%, 33% and 33% across those doses. Daily doses of 647 to 1032 ug accounted for 80% to 90% of the estimated maximum reduction. The window was measured on a blood marker of B12 status, not on a symptom.

  Eussen et al., 2005 (Arch Intern Med)PMID 15911731

  Promising
• Vitamin B12serum levels peak about seven hours after a single tabletMeasured within a day

  An open-label randomised single-dose pharmacokinetic study in 20 healthy men aged 20 to 45, conducted and authored by staff of Emisphere Technologies, the developer of the SNAC carrier under test, measured serum vitamin B12 after one 5 mg cyanocobalamin tablet, with six men on the marketed tablet. Time to peak serum B12 was 6.83 hours for the marketed tablet and 0.5 hours for the carrier coformulation. Absolute bioavailability was 2.16% and 5.09% respectively. One trial, six men per arm. Serum concentration was measured, not any symptom.

  Castelli et al., 2011 (Clin Ther)PMID 21722960

  Early

Windows measured in the cited trials. Context for how the active behaves over time, not a statement about any individual and not a claim about this product.

How each ingredient usually behaves over time.

One ingredient, from its own page.

• Vitamin B12

  Markers move first. Methylmalonic acid and homocysteine start shifting within a week or two, while anything you would notice takes several weeks of daily use.

  Its own page, the plain answer on timing ↗

How each ingredient usually behaves over time, from its own page on IngredientMD. General timing for the ingredient, not a measurement of this product.

Finished dose form

It arrives as a finished, measured serving, so there is nothing to weigh or mix before you take it.

Studied alongside this brand's other formulas

Where two of this brand's products carry actives the literature has read together, the pairing and its basis are below. The evidence word is the corpus row's own confidence, never a score.