Checked against public sources on July 25, 2026 · LookCloser does not sell or recommend supplements.
Does the marketing hold up?
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.
“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.
The public sources did not settle the marketing promises on this label.
Published research exists for ingredients in this formula — see Related research below. Whether this product’s doses match those studies could not be confirmed.
Ingredient research can support context, but it is not a trial of this exact product.
Headlines first. Open evidence only when you want the source trail.
The public ownership record is ambiguous. We show the exact candidates instead of choosing one by name similarity.
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 findingEvery ingredient shows its real amount — nothing is hidden in a proprietary blend.
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 findingThe barcode matches, so we are checking the right product rather than a look-alike.
The brand's store lists this exact barcode as “Magnesium Glycinate, 300mg” (variant: 90ct) — identity confirmed across retailer listings.
Locked evidence record →Open the full source-linked findingGradual growth is more ordinary. A sudden burst deserves a closer look.
Written reviews grew from 421 to 537 across 2026-02-09 – 2026-07-22 with no single manufactured spike (largest 30-day gain ~26).
Locked evidence record →Open the full source-linked findingThese are evidence gaps, not strikes against the product.
These are the USPTO records behind the brand name. We show them all rather than choosing one by similarity.
Delaware, USA · Registration 7724060
10 Bloomfield Ave., Building B, Pine Brook, New Jersey 07058, UNITED STATES
IC 005: Nutritional supplements.
NEVADA, USA; DELAWARE, USA · Registration 4690885
39 Plymouth Street, Fairfield, NEW JERSEY 07004, UNITED STATES
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 ↗
The label amount is shown beside the ranges used in the linked ingredient studies.
300 mg per serving — within the 200–420 mg/day used in the linked studies.
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 300 mg of magnesium per serving. Studies we found used 200 mg–420 mg a day, so this sits inside that range.
Study ranges differ between trials and change as research changes. This is background reading, not a pass, a failure, or a recommendation.
$0.38 per labeled serving
matching UPC/GTIN · checked Jul 25, 2026
View on Amazon ↗$0.44 per labeled serving
matching UPC/GTIN · checked Jul 24, 2026
View on Brand website ↗$0.47 per labeled serving
matching UPC/GTIN · checked Jul 24, 2026
View on iHerb ↗Search results remain not linked to this exact product until this retailer publishes the matching UPC/GTIN.
Search Target ↗Search results remain not linked to this exact product until this retailer publishes the matching UPC/GTIN.
Search Walmart ↗Same UPC/GTIN observed across 3 sellers. Amazon was lowest at $17.13; iHerb was highest at $21.00 — a $3.87 range at check time.
The observed listing and exact brand page repeat 300 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.
The full report shows every source, the exact unresolved question, and the documentation that would settle it.
Record built July 25, 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.