Checked against public sources on July 25, 2026 · LookCloser does not sell or recommend supplements.
Does the marketing hold up?
The listing and related brand page both say it is tested, but neither names the lab. A related brand page repeats the marketing claim, but its UPC is not published and repetition is not independent testing evidence. A named issuer and lot-specific report would make it checkable.
“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.
No named laboratory or lot-specific certificate was found for this exact product. A related brand page repeats a testing claim but names no issuer; its UPC is not published. NSF, IFOS, USP, and Informed-Sport were not checked in this record. This is a public-evidence limit, not a finding that testing did not occur.
We looked and found no public proof. That does not count against the product.
Headlines first. Open evidence only when you want the source trail.
Gradual growth is more ordinary. A sudden burst deserves a closer look.
Written reviews grew from 580 to 650 across 2026-02-10 – 2026-07-21 with no single manufactured spike (largest 30-day gain ~19).
Locked evidence record →Open the full source-linked findingThese are evidence gaps, not strikes against the product.
The label amount is shown beside the ranges used in the linked ingredient studies.
$0.07 per labeled serving
matching UPC/GTIN · checked Jul 25, 2026
View on Amazon ↗Official shopping lead; excluded from exact price comparisons.
Magnesium Glycinate 500mg, 240 Veggie Capsules · 240 Count (Pack of 1). Confirm the package UPC/GTIN before buying.
Check brand website ↗Search results remain not linked to this exact product until this retailer publishes the matching UPC/GTIN.
Search 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 ↗Only one exact price was available at build time; prices change by date, seller, and promotion.
The brand-page price is shown as a shopping lead only. It is excluded from the exact-product price difference because the page does not publish this record's matching UPC/GTIN.
The observed listing and related brand page repeat 500 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.