“Magnesium 420 mg per serving”
Evidence →The label promises 420 mg per serving. The panel says 420 mg. They match.
Exact product checked · GTIN 00898440001844Qunol · checked Jul 26, 2026USPTO returned 2 exact supplement-class owner records · inspect the identity trailPackage says distributed by: MDF Instrument
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Quick read · Qunol
Qunol Magnesium Extra Strength 420 mg
Checked against public sources on July 26, 2026 · LookCloser does not sell or recommend supplements.
180capsules · 90 servings
Does the marketing hold up?
FDA recall appears in this brand's history. An exact-product recall is a direct signal. A different product from the same firm is company context, not a strike against this item.
Is the dose real?✓Listing and panel agreeboth say 420 mg of Magnesium
What a serving costs$0.19per serving, at the checked price
Is it tested?No testing claim made
Who’s behind it?USPTO lists 2 owner recordssame brand name, more than one registrant — we don’t choose between them
Is it the real thing?✓Barcode matches outside records
Trouble on record?Brand history — not this product
“Couldn’t verify” means we looked and found no public proof — not a mark against the product. Most supplement claims cannot be independently verified by anyone, so grey is the normal state of this industry.
1✓ checked out1◖ partly confirmedno contradictions · brand-level recall on file
The label itself
What the Supplement Facts panel says
| Magnesium | 420 mg |
|---|
We read only 1 line from this label. A Supplement Facts panel normally lists several more, so treat this as incomplete rather than as the whole label.
Marketing claims, checked
The checks, one by one
1 promise checks out. 1 could not be fully confirmed from public sources.
✓Matches the label1
◐Partly confirmed1
“NERVE, BONE, & MUSCLE HEALTH: Magnesium plays an essential role in supporting nerve, bone, and muscle health; Magnesium, especially in magnesium…”
Evidence →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.
Ingredient research can support context, but it is not a trial of this exact product.
Marketing language, not scored
EXTRA STRENGTH
Quick read · 6 useful findings
What is worth knowing.
Headlines first. Open evidence only when you want the source trail.
Needs explanationAny trouble in public records?
FDA recall appears in this brand's history
An exact-product recall is a direct signal. A different product from the same firm is company context, not a strike against this item.
Evidence and sources
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…”
Locked evidence record →Open the full source-linked findingPublic contextWho is behind it?
Registered owner records: Quten Research Institute, LLC · Quten IP Holdings, LLC
The public ownership record is ambiguous. We show the exact candidates instead of choosing one by name similarity.
Evidence and sources
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.
Locked evidence record →Open the full source-linked findingCheckedIs the label honest?
Listing claim matches the Supplement Facts panel
The label promise and the Supplement Facts amount agree.
Evidence and sources
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.
Locked evidence record →Open the full source-linked findingCheckedIs the label honest?
Every ingredient shows its amount · 1 ingredients listed.
Every ingredient shows its real amount — nothing is hidden in a proprietary blend.
Evidence and sources
The panel gives a per-ingredient amount rather than hiding quantities inside a proprietary blend, so each one can be compared to published research.
Locked evidence record →Open the full source-linked findingCheckedWho is behind it?
The barcode identity checks out · 898440001844.
The barcode matches, so we are checking the right product rather than a look-alike.
Evidence and sources
The brand's store lists this exact barcode as “Magnesium Extra Strength 420 mg” (variant: 180ct) — identity confirmed across retailer listings.
Locked evidence record →Open the full source-linked findingPublic contextWill you get what you pay for?
Reaching a studied dose costs about $6/month
Comparing cost at a research-relevant amount shows how quickly the package is used and what the routine actually costs.
Evidence and sources
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.
Locked evidence record →Open the full source-linked findingWhat remains open 2
- We have not found a public label filing for this exact product.
- No dated review-history series is on file yet.
These are evidence gaps, not strikes against the product.
Who owns the brand wordmark?
The brand has 2 exact supplement-class records
These are the USPTO records behind the brand name. We show them all rather than choosing one by similarity.
🇺🇸Quten Research Institute, LLC
Delaware, USA · Registration 7724060
10 Bloomfield Ave., Building B, Pine Brook, New Jersey 07058, UNITED STATES
Goods covered by this record
IC 005: Nutritional supplements.
🇺🇸Quten IP Holdings, LLC
NEVADA, USA; DELAWARE, USA · Registration 4690885
39 Plymouth Street, Fairfield, NEW JERSEY 07004, UNITED STATES
Goods covered by this record
IC 005: Dietary supplements.
This answers who owns registrations for the brand wordmark. It does not by itself prove which entity made, imported, or sold this specific product. Open USPTO source ↗
Research behind the findings
Dose and research context
The label amount is shown beside the range used in the linked ingredient studies.
Dose vs research
Magnesium
STUDIED RANGE0525 mg
420 mg per serving — within the 200–420 mg/day used in the linked studies.
Linked ingredient research · label amount, not a recommendation
Background reading
What the research says about these amounts
Not a score. Studies disagree with each other and change over time, so this sits beside the evidence rather than counting toward it — it is here so you can read the sources yourself.
The panel lists 420 mg of magnesium per serving. Studies we found used 200 mg–420 mg a day, so this sits inside that range.
0studied 200 mg–420 mg
Study ranges differ between trials and change as research changes. This is background reading, not a pass, a failure, or a recommendation.
Where it sells
Price check for this exact product
Amazon
Exact UPC/GTIN match$17.39
$0.19 per labeled serving
matching UPC/GTIN · checked Jul 26, 2026
View on Amazon ↗Brand website
Exact UPC/GTIN match$19.99
$0.22 per labeled serving
matching UPC/GTIN · checked Jul 26, 2026
View on Brand website ↗iHerb
Not confirmedNo exact listing saved
We only show a price when the seller publishes the same barcode as the bottle. We haven’t found that match here.
Search iHerb ↗Target
Not confirmedNo exact listing saved
We only show a price when the seller publishes the same barcode as the bottle. We haven’t found that match here.
Search Target ↗Walmart
Not confirmedNo exact listing saved
We only show a price when the seller publishes the same barcode as the bottle. We haven’t found that match here.
Search Walmart ↗Same UPC/GTIN observed across 2 sellers. Amazon was lowest at $17.39; Brand website was highest at $19.99 — a $2.60 range at check time.
The observed listing and exact brand page repeat 420 mg. That confirms cross-page consistency of the published claim, not the product contents.
Reference prices only · no affiliate links · every compared seller must publish the matching UPC/GTIN.
Want to inspect the evidence?
The full report shows every source, the exact unresolved question, and the documentation that would settle it.
Record built July 26, 2026. Sources: source listing observed at check time · USPTO Trademark Search · Keepa exact-listing history · NIH / published research · certification and regulator records where available. LookCloser publishes evidence and gaps; it does not advise for or against any supplement. Evidence-based corrections welcome.