Checked against public sources on July 31, 2026 · LookCloser does not sell or recommend supplements.
Does the marketing hold up?
Every ingredient shows its amount · 3 ingredients listed. Every ingredient shows its real amount — nothing is hidden in a proprietary blend.
“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.
| Zinc (as L-OptiZinc® L-Methionine Zinc Complex) | 15 mg |
|---|---|
| Copper (as Albion® Copper Bisglycinate Chelate) | 1 mg |
| Quercefit® (Sophora japonica Leaf Extract & Sunflower Lecithin) (Standardized to 34% Quercetin, providing 85 mg Quercetin) | 250 mg |
We read 3 lines from the package photograph. It is our transcript of the label, not the manufacturer’s panel, and it may be incomplete.
1 promise needs a closer look.
Published research exists for ingredients in this formula. Whether this product’s doses match those studies could not be confirmed.
“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.
We found no named, citable study of this product or formula. The claim may rest on ingredient research rather than a trial of this product.
“Made in USA” can describe only final bottling. Ingredient-sourcing records were not located for this product.
We looked and found no public proof. That does not count against the product.
Powerful Immune & Respiratory Support Complex · Superior Absorption
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 findingA government label filing makes the listed formula easier to inspect and compare over time.
Label #305970 “Zinc Defense” (Pure TheraPro Rx), entered 2024-01-24, with the full Supplement Facts on file. Company on file: Distributor — Pure TheraPro Rx, Westminster, CO.
Locked evidence record →Open the full source-linked findingThese are evidence gaps, not strikes against the product.
Filed address
#6080, 8781 Sheridan Boulevard, Westminster, COLORADO 80003, 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 range used in the linked ingredient studies.
15 mg per serving — within the 8–40 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 15 mg of zinc per serving. Studies we found used 8 mg–40 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.
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Lowest New observed via Keepa on 2026-08-01.
View on Amazon ↗Useful official shopping lead; excluded from exact price comparisons.
Zinc Defense · 60 capsules. The page matches 15 mg, but omits the identifier needed to bind the exact sellable unit.
Check brand website ↗No matching product page was confirmed in the current record. Search results cannot be attached as this product until the UPC/GTIN matches.
Search iHerb ↗No matching product page was confirmed in the current record. Search results cannot be attached as this product until the UPC/GTIN matches.
Search Target ↗No matching product page was confirmed in the current record. Search results cannot be attached as this product until the UPC/GTIN matches.
Search Walmart ↗The related page's review pool may differ from the observed listing. Because the page does not publish a matching UPC/GTIN, LookCloser does not attribute that review aggregate to this exact sellable unit.
Prices and stock are point-in-time observations. Related pages are never used as product evidence. No affiliate links; LookCloser earns nothing from these sellers.
The summary stops at product-specific facts. The full report preserves every source, calculation, limitation, and unresolved check for review or sharing.
Record built August 02, 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.