Checked against public sources on July 24, 2026 · LookCloser does not sell or recommend supplements.
Does the marketing hold up?
The observed listing says it is tested, but names no lab or certifier. A testing badge without an issuer or report is a marketing claim, not evidence. Ask for the lab name and lot-specific report.
“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. No exact brand product page was available for a document check. Under NSF/ANSI 173, NSF lists Thorne® products, including Thorne® L-Glutamine Powder, but not this exact SKU. 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.
The barcode matches, so we are checking the right product rather than a look-alike.
Open Food Facts resolves 693749015338 to "Magnesium Glycinate" (Thorne) — consistent with this listing.
Locked evidence record →Open the full source-linked findingGradual growth is more ordinary. A sudden burst deserves a closer look.
Written reviews grew from 226 to 519 across 2026-02-14 – 2026-07-23 with no single manufactured spike (largest 30-day gain ~72).
Locked evidence record →Open the full source-linked findingThese are evidence gaps, not strikes against the product.
Filed address
25820 Highway 2 West, Sandpoint, IDAHO 83864, UNITED STATES
USPTO identifies the public owner or applicant behind this brand wordmark. This does not by itself identify the product manufacturer or prove where the product was made. Open USPTO source ↗
The label amount is shown beside the ranges used in the linked ingredient studies.
$0.29 per labeled serving
matching UPC/GTIN · checked Jul 25, 2026
View on Amazon ↗$0.29 per labeled serving
matching UPC/GTIN · checked Jul 24, 2026
View on Target ↗$0.29 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 Walmart ↗Same UPC/GTIN observed across 3 sellers at the same price at check time.
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 24, 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.