Checked against public sources between July 21 and September 3, 2026 · LookCloser does not sell or recommend supplements.
Does the marketing hold up?
Package and trademark records name different responsible entities. The package says manufactured for: nutricost, 351 E 1750 N, Vineyard, UT 84059. USPTO names eSupplements, LLC as the exact wordmark owner. That can be a normal distributor, manufacturer, or licensing…
“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.
| N-Acetyl L-Cysteine (NAC) (vegan) | 600 mg |
|---|
Printed on the package: QUALITY GUARANTEED · VEGAN · GMP · Vegan PRODUCT · GMP COMPLIANT FACILITY · NON-GMO PRODUCT · ANIMAL-FREE · QUALITY nutricost GUARANTEED
We read 1 lines from the package photograph. It is our transcript of the label, not the manufacturer’s panel, and it may be incomplete.
The public sources did not settle the marketing promises on this label.
A testing body is named on the brand page (NSF), but we found no lot-specific certificate of analysis.
“GMP-certified” describes factory processes, not what is in the bottle. The claim does not name a certifier or public register that a shopper can check.
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.
Every 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 “Nutricost N-Acetyl L-Cysteine (NAC) Capsules” (variant: 180 Capsules / 600 Milligrams) — identity confirmed across retailer listings.
Locked evidence record →Open the full source-linked findingThese are evidence gaps, not strikes against the product.
Filed address
UTAH, USA) DBA Nutricost; 351 E 1750 N, VINEYARD, UTAH 84059, 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 ↗
$0.09 per labeled serving
matching UPC/GTIN · checked Sep 2, 2026
View on Amazon ↗$0.10 per labeled serving
matching UPC/GTIN · checked Jul 21, 2026
View on Brand website ↗$0.11 per labeled serving
matching UPC/GTIN · checked Jul 24, 2026
View on iHerb ↗We only show a price when the seller publishes the same barcode as the bottle. We haven’t found that match here.
Search Target ↗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 3 sellers. Amazon was lowest at $15.95; iHerb was highest at $18.95 — a $3.00 range at check time.
The observed listing and exact brand page repeat 600 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 September 03, 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.