Who makes Kirkland Signature Daily Multi (Multivitamin), 500 Tablets?
As of September 7, 2026, evidence points to International Vitamin Corporation as the manufacturer of Kirkland Signature Daily Multi (Multivitamin), 500 Tablets, but no tier 1–3 source names the link directly.
The common claim
What’s commonly claimed, and what the evidence supports
The usual online answer credits Nature Made (Pharmavite), a claim that borrows from the fact that Costco's fish oil listing does carry Pharmavite in its manufacturer field. But the Daily Multi is different: Costco's own product-listing data for it names INTERNATIONAL VITAMIN (International Vitamin Corporation, or IVC, a leading US private-label supplement manufacturer that serves club and mass retailers) in the manufacturer field, not Pharmavite. Some sources instead cite Lang Pharma Nutrition, which Costco customer service has named for a different Kirkland multivitamin (the organic line). For the standard Daily Multi, the listing points to IVC, so the attribution grades probable.
Evidence & sources
Each source is graded on the six-tier evidence rubric, where tier 1 is strongest. Sources are archived, so a citation still works if the original page moves or goes behind a paywall.
Tier 4
Costco's own product page for the Daily Multi (item 11491625) embeds catalog JSON with a manufacturer field: the 2026-01-24 snapshot carries "INTERNATIONAL VITAMIN" in that field on one item record (a sibling record masks the field with the brand name, "Kirkland Signature(TM)"). The page is also marked USP Verified. "INTERNATIONAL VITAMIN" resolves to International Vitamin Corporation (IVC). Graded probable, not confirmed: it is an internal catalog field rather than an editorial statement, and could name the vendor of record rather than the encapsulating plant, though for a private-label supplement those are normally the same company. The value differs from Costco's fish oil (PHARMAVITE), so the two Kirkland supplements do not share a maker.
Tier 6
Corroboration that "INTERNATIONAL VITAMIN" is a real finished-supplement manufacturer rather than a brand: IVC's own site describes it as a private-label supplement manufacturer whose programs "power thousands of store brands" for US food, drug, mass, and club retailers, the channel Costco sits in. It does not name Kirkland or Costco, so it is general corroboration (tier 6) for the reading of Costco's manufacturer field, not a brand-to-manufacturer link.
Frequently asked
Who makes Kirkland Signature Daily Multi vitamins?
Are Kirkland vitamins made by Nature Made?
Is Kirkland Daily Multi USP Verified?
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