The dose claim fits the serving — physically possible
Claimed magnesium 420.0 mg is 42% of the ≈1,000 mg serving (serving size on the label, keyed to UPC 898440001844) — within physical limits.
Full record · 898440001844 · back to the summary
Qunol Magnesium Extra Strength 420 mg
Exact product checkedGTIN 00898440001844 · checked 2026-07-26
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How to read this report
What this is. We compare what a listing claims against what public records show — label arithmetic, barcode registries, NIH’s label catalog, FDA enforcement data, certification registries, and published research. Every statement below traces to one of those.
What the states mean. Confirmed = an outside source agrees. Contradicted = an outside source disagrees. Caution = something needs explaining. No data = we looked and found nothing — a gap, not a strike.
What it is not. A clean record is not an endorsement and never proof a product works. A thin record is not an accusation. We publish evidence and gaps; the conclusion is yours. Nothing here is medical advice.
Something wrong? Every figure is meant to be checkable — sources are named and linked. Send a correction and we’ll fix the record.
Panel, decoded
The 420 mg magnesium claim matches the panel
MARKETING420 mg — per-serving claim
PANELMagnesium 420 mg — same amountMagnesium 420 mg
matches panelWe did the comparison: the listing claims 420 mg of magnesium, and the listing-image panel shows 420 mg magnesium 2 capsules. Those amounts agree. This is internal consistency, not independent lab testing.
| Panel row | Amount | %DV | What to notice |
|---|---|---|---|
| Magnesium | 420 mg | — |
FDA rules (21 CFR 101.36) require the amount of each dietary ingredient per serving unless hidden in a listed “proprietary blend” (legal, but a transparency yellow flag). A label stating no amount at all is non-compliant — a checkable red flag. This panel states amounts; any remaining comparison concerns the front-label framing.
vision:google/gemini-flash-1.5 Amounts are shown as listed panel data, not independently lab-tested contents.
Every check we ran
Confirmed evidence
What checked out4
These checks found support in the public record. They confirm specific facts, not the product as a whole.
Confirmed
Every ingredient amount is disclosed
The panel gives a per-ingredient amount rather than hiding quantities inside a proprietary blend, so each one can be compared to published research.
Found on the brand's own store
The brand's store lists this exact barcode as “Magnesium Extra Strength 420 mg” (variant: 180ct) — identity confirmed across retailer listings.
Barcode confirmed in an outside database
Open Food Facts resolves 898440001844 to "Extra Strength Magnesium" (Qunol Minerals) — consistent with this listing.
Documented concerns
What needs caution0
These are documented contradictions or claims that need more evidence. They are separate from missing data.
No contradictions or product-specific cautions were found at this check depth.
Unresolved public record
What is still missing8
We looked for these signals but could not settle them from public sources. A gap is not a strike.
Review-count history: not available
Marketplace rating not shown★ — rating count unavailable. No exact-listing count history was available, so no review-pattern claim is made.
Multiple USPTO brand-owner records are shown
USPTO returned multiple live supplement-class records for the exact brand wordmark: Quten Research Institute, LLC, Quten IP Holdings, LLC. These records answer who owns registrations for the brand; the separate product-to-owner or manufacturer link remains open.
Listing claim matches the label panel
The listing claims 420 mg; the photo-read Supplement Facts panel shows Magnesium at 420 mg per serving — the listing text and its photo-read panel agree; this is internal consistency, not independent testing.
Magnesium amount, in daily-intake context
label states 420 mg/serving — about 100% of the adult daily reference (adult RDA 310–420 mg elemental; NIH sets 350 mg/day as the supplemental upper level for elemental magnesium). A single serving isn’t meant to supply a full day, so this is context, not a shortfall. Caveat: chelate labels (glycinate, citrate) often state compound mass, which reads ~5–7× higher than elemental magnesium — the Supplement Facts panel settles which is meant. Sources: NIH ODS — Magnesium fact sheet, PubMed search: magnesium glycinate supplementation.
Cost to reach a studied dose
At 1.0 serving(s) a day to reach the low end of the studied range (200–420 mg), this product runs roughly $6 per month. A price observation, not a recommendation.
Research context is available for the listed ingredients
Published sources describe how magnesium have been studied. This is ingredient context only; the record does not establish that this product delivers the studied dose or outcome. Sources: NIH ODS — Magnesium fact sheet, PubMed search: magnesium glycinate supplementation.
FDA recall appears in this brand's history
This recall is not about the product on this page. QUTEN RESEARCH INSTITIUTE LLC recalled a different product on December 16, 2025. FDA lists that case as Ongoing. The recalled item was “Qunol, Extra Strength Turmeric Capsule, 1000mg ,HDPE bottle with cap, BIO7771 120 count bottle, BIO7772 120 count bottle ,BIO8281 60 count bottle .”. FDA recorded the reason as “Mold contamination detected for raw material lots that were produced in July and used in finished goods”. Verify at FDA’s recall database.
Public label filing not saved
We have not found a public label filing for this exact product. That is a gap in our records, not evidence that no filing exists.
What to ask and check
What would settle the open questions
Why is this shown?
Everything we couldn’t verify is something a person can still ask about. Rather than leave gaps sitting as dead ends, we turn each one into a specific question — the exact document, citation, or number that would settle it — plus the things you can confirm yourself with the bottle in your hand.
Ask the brand or seller
1
Answered by the panel: 0.42 g of the 0.42 g headline is magnesium. Which independent lab can confirm that amount in this product?
The panel resolves the front-label arithmetic. The remaining question is lot-specific contents and stability; published category testing gives context, not a test of this product.
2
Is this label filed with NIH’s Dietary Supplement Label Database (DSLD)?
Filing is voluntary, so absence proves nothing — but a filed label puts the full ingredient table on public record where anyone can read it.
Most brands and sellers publish a contact route. A clear answer adds evidence to the record; no answer leaves the question open.
Check for yourself — no one’s permission needed
1
Compare the panel on the bottle in your hand to the one shown in this record.
Ours was read from listing photos and can contain reading errors. The physical label is the source of truth — if they disagree, tell us and we’ll correct the record.
2
Scan the barcode on the package and confirm it reads 898440001844.
A mismatch between the barcode on the box and the one on the listing is worth pausing over — it can indicate a different variant, a repack, or a counterfeit.
3
Check the lot number and expiry on the bottle against any COA you’re given.
A certificate that doesn’t name your lot doesn’t describe what you’re holding.
These are the open questions on this specific record — not a warning about the product, and not a suggestion to buy or avoid it. Getting them answered is how you decide for yourself.
What the listing promises — claim by claim
Why is this shown?
A listing’s promises are the reason people buy. Each one gets its own row: what was promised, what evidence would settle it, and what we could actually find. We never call a claim false — only whether proof proportionate to it exists on the public record.
| Claim | Status | What we found |
|---|---|---|
| Benefit claim “…PROMOTES NERVE, BONE, & MUSCLE HEALTH: Magnesium plays an essential role in supporting nerve, bone, and muscle health; Magnesium, especially in magnesium glycinate form,” | Partly supported We looked for: whether the ingredient doses on the label match the doses used in published research | Ingredient evidence exists; on dose: label states 420 mg/serving — about 100% of the adult daily reference (adult RDA 310–420 mg elemental; NIH sets 350 mg/day as the supplemental upper level for elemental magnesium). A single serving isn’t meant to supply a full day, so this is context, not a shortfall. Caveat: chelate labels (glycinate, citrate) often state compound mass, which reads ~5–7× higher than elemental magnesium — the Supplement Facts panel settles which is meant. |
“No evidence located” does not mean a claim is false — it means the seller has not put evidence proportionate to the claim on the public record, and we could not find any. Absence of proof is not proof of absence.
This label vs. the doses studied
Why is this shown?
An ingredient can be well-studied at one amount and barely studied at the amount in your bottle. This lines the label up against the doses researchers actually used. It answers ‘are these the same numbers?’ — never ‘should you take this?’
| Ingredient | Where this label sits | Reading |
|---|---|---|
| Magnesium | shaded = doses used in studies (200 mg–420 mg) · bar = this label | 420 mg — within the studied range |
Matching a studied dose does not mean the product works, and missing it does not mean it fails — it shows whether the label and the research are talking about the same amounts. Not a recommendation to take any amount.
Documented cautions
- magnesium — daily oral use; chelated forms (glycinate) are studied for absorption — note labels may state compound mass rather than elemental magnesium, which differs ~7-fold
Statements from published sources about these ingredients — not advice about this product, and not a complete safety review. Anyone taking medication should talk to a pharmacist or clinician.
Verifiability profile — 4 of 6 public signals
✓ Per-serving dose established✓ UPC / GTIN published✓ Supplement Facts visible in photos✓ Brand's own store found· Found in NIH's label catalog (DSLD) — not published· Third-party lab named or registry-certified — not published
What this listing gives the public to check. Publishing these signals doesn't prove quality — but withholding them means claims can only be taken on faith.
Identity
| UPC (barcode) — also our record ID | 898440001844 — via source listing UPC |
| Brand | Qunol |
| Source listing identifier | B0CKGDP313 |
| Retailer listing title | Qunol Magnesium 420mg, Extra Strength, High Absorption, Vegetarian, 18… show full titleQunol Magnesium 420mg, Extra Strength, High Absorption, Vegetarian, 180ct |
| USPTO brand-owner record | Quten Research Institute, LLC · Delaware, USA · registration 7724060 · 10 Bloomfield Ave., Building B, Pine Brook, New Jersey 07058, UNITED STATES |
| USPTO brand-owner record | Quten IP Holdings, LLC · NEVADA, USA; DELAWARE, USA · registration 4690885 · 39 Plymouth Street, Fairfield, NEW JERSEY 07004, UNITED STATES |
From the label (photo-read)
| Serving size | 2 Capsules |
| Servings per container | 90 |
| Pack statement | 180 CAPSULES |
Supplement Facts panel (photo-read):
| Ingredient | Amount per serving | Reading confidence |
|---|---|---|
| Magnesium | 420 mg | High clearly legible in the photo |
Claims printed on the packaging:
“ENHANCED ABSORPTION” · “EXTRA STRENGTH” · “Promotes Nerve, Bone & Muscle Health” · “Promotes Nerve, Bone and Muscle Health*” · “Helps Support Restful Sleep*” · “*These statements have not been evaluated by the Food and Drug Administration.” · “This product is not intended to diagnose, treat, cure, or prevent any disease.” · “High Absorption”
Read by a vision model from 8 listing photos — verbatim extraction; OCR errors possible. Spot a mistake? It will be corrected on review.
Listed ingredients (as stated on the listing)
Gelatin, Silicon Dioxide, Magnesium Stearate
Where it sells
| Seller | Price |
|---|---|
| Retailer listing ↗ | $17.39 checked Jul 26, 2026 — varies by variant/session; price history pending |
| Brand store (qunol.com) ↗ | $19.99 variant: 180ct — matching UPC/GTIN |
Brand store qunol.com: 33 supplement products (+9 merch items) — a single-category catalog.
Reference links for identification only — LookCloser has no affiliate relationships and earns nothing from any link on this page.
Ingredient science — NIH references
Magnesium — NIH ODS · MedlinePlus · PubMed (11,814) · UL 350 mg (SUPPLEMENTAL magnesium only (not from food))
Reference data from the NIH Office of Dietary Supplements, IOM Dietary Reference Intakes, and PubMed. A Tolerable Upper Intake Level is a documented reference figure, not a safety verdict — both the listed amount and the reference are shown for your own judgment. LookCloser gives no medical advice.
Related research & consistency
magnesium — NIH ODS — Magnesium fact sheet · PubMed search: magnesium glycinate supplementation · WebMD: magnesium · ClinicalTrials.gov — 3,206 registered studies
ℹ Dosage: label states 420 mg/serving — about 100% of the adult daily reference (adult RDA 310–420 mg elemental; NIH sets 350 mg/day as the supplemental upper level for elemental magnesium). A single serving isn’t meant to supply a full day, so this is context, not a shortfall. Caveat: chelate labels (glycinate, citrate) often state compound mass, which reads ~5–7× higher than elemental magnesium — the Supplement Facts panel settles which is meant.
ℹ Use pattern in research: daily oral use; chelated forms (glycinate) are studied for absorption — note labels may state compound mass rather than elemental magnesium, which differs ~7-fold.
These notes state where label numbers and marketing framing sit relative to published research — documentation for your own judgment, not medical advice. LookCloser does not advise for or against taking any supplement.
Record 898440001844 · built July 26, 2026 · lookcloser.ai · corrections@lookcloser.ai