Kirkland Signature

Is Kirkland Signature third-party tested?

Yes — as of 2026-08-17, Kirkland Signature holds 4 third-party certifications across 2 independent testing programs: Labdoor, USP Verified. Every certification below links to the certifying body's official listing so you can verify it at the source.

Registries checked (as of 2026-08-17): Informed · NSF · USP · Labdoor · BSCG