LookCloser.aipublic supplement evidence
Exact product checked · barcode not publishedKIRKLAND · checked Aug 12, 2026 · on sale since Sep 2, 2013Package says distributed by: Costco Wholesale Corporation · P.O. Box 34535, Seattle, WA 98124-1535 USA
Quick read · KIRKLAND

Kirkland Signature Extra Strength D3 50 mcg

Checked against public sources on August 12, 2026 · LookCloser does not sell or recommend supplements.

600softgels

Does the marketing hold up?

Every ingredient shows its amount · 1 ingredients listed. Every ingredient shows its real amount — nothing is hidden in a proprietary blend.

Is the dose real?Panel read — dose not verified1 ingredient listed; no advertised amount we could confirm against them
What a serving costsNo price found for this exact barcode
Is it tested?USP seal printed on the labelwe read it off the package photo; not confirmed in USP’s registry
Who’s behind it?No exact match in USPTO
Is it the real thing?No barcode publishedso it can’t be matched against certification, recall or other retailer records
Trouble on record?✓No recalls found
The label itself

What the Supplement Facts panel says

Serving size Serving Size 1 Softgel

Vitamin D3 (Cholecalciferol)50 mcg (2,000 IU)

Printed on the package: USP VERIFIED

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.

Quick read · 1 useful finding

What is worth knowing.

Headlines first. Open evidence only when you want the source trail.

CheckedIs the label honest?

Every ingredient shows its amount · 1 ingredients listed.

Every ingredient shows its real amount — nothing is hidden in a proprietary blend.

Evidence and sources

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 finding
What remains open 2
  • No FDA recall matched this brand in the current search.
  • Brand ownership is not settled in this record.

These are evidence gaps, not strikes against the product.

Buying options

Where you can check or buy it

Only the submitted seller page is identity-certain. Other destinations are shown as leads until a shared UPC/GTIN confirms the exact product.

Amazon

Submitted listing
$14.99

Lowest New observed via Keepa on 2026-08-13.

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iHerb

Not confirmed
No price confirmed

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 ↗

Target

Not confirmed
No price confirmed

No matching product page was confirmed in the current record. Search results cannot be attached as this product until the UPC/GTIN matches.

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Walmart

Not confirmed
No price confirmed

No matching product page was confirmed in the current record. Search results cannot be attached as this product until the UPC/GTIN matches.

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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.

Want to inspect the evidence?

The full report shows every source, the exact unresolved question, and the documentation that would settle it.

Read / share full evidence →

Record built August 12, 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.