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Kirkland Signature
Kirkland Signature is Costco's store brand. The USP Verified directory lists vitamins, minerals, fish oil, krill oil, and joint tablets under this name. One whey flavor is on the Informed-Choice list. Many other Kirkland supplements are not on either list.
Checked 15 October 2026. 17 products below. Programs: USP Verified, Informed Choice. A seal applies to the named product, not to every bottle this brand sells. Lists change; use the certifier link before you treat a seal as current.
Which certifications, and where to recheck them
- USP Verified — These names were on the USP Verified product directory at quality-supplements.org on 15 October 2026.
- Informed Choice — These names are on the October 2026 Informed-Choice banned-substance list published by LGC.
Products on the official list
| Product | Certification | Ingredient page |
|---|---|---|
| Kirkland Signature Magnesium Citrate 250 mg Softgels | USP Verified | Magnesium citrate Softgel |
| Kirkland Signature Chewable Vitamin C 500 mg Tablets | USP Verified | Vitamin C (moderate dose) Tablet |
| Kirkland Signature Vitamin C 250 mg Adult Gummies | USP Verified | Vitamin C (moderate dose) Gummy |
| Kirkland Signature Calcium Citrate, Magnesium and Zinc Tablets | USP Verified | Calcium, Magnesium, Zinc Tablet |
| Kirkland Signature Calcium 600 mg with Vitamin D3 Tablets | USP Verified | Calcium, Vitamin D3 Tablet |
| Kirkland Signature Daily Multi Tablets | USP Verified | Multivitamins (healthy adults) Tablet |
| Kirkland Signature Adult Multivitamin Gummies | USP Verified | Multivitamins (healthy adults) Gummy |
| Kirkland Signature Children's Multivitamin Gummies | USP Verified | Multivitamins (healthy adults) Gummy |
| Kirkland Signature Vitamin E 180 mg Softgels | USP Verified | — Softgel — On the USP list. Not linked to the mixed-tocopherol vitamin E page. |
| Kirkland Signature Fish Oil 1000 mg Softgels | USP Verified | Omega-3 (EPA/DHA) Softgel |
| Kirkland Signature Wild Alaskan Fish Oil 1400 mg Softgels | USP Verified | Omega-3 (EPA/DHA) Softgel |
| Kirkland Signature Krill Oil 500 mg Softgels | USP Verified | Krill oil Softgel |
| Kirkland Signature Glucosamine & Chondroitin Tablets | USP Verified | Glucosamine / Chondroitin Tablet |
| Kirkland Signature Glucosamine with MSM Tablets | USP Verified | Glucosamine / Chondroitin Tablet |
| Kirkland Signature Energy Shot | USP Verified | — Shot — On the USP list. An energy shot, not mapped to a single ingredient page. |
| Kirkland Signature Extra Strength Energy Shot | USP Verified | — Shot |
| Kirkland Signature Whey Protein Creamy Chocolate | Informed Choice | Whey protein Powder |
Supplement pages
These links go to the ingredient pages, which describe the evidence. The certification above is about the named product, not about whether the ingredient works.
- Magnesium citrate
- Vitamin C (moderate dose)
- Calcium
- Magnesium
- Zinc
- Vitamin D3
- Multivitamins (healthy adults)
- Omega-3 (EPA/DHA)
- Krill oil
- Glucosamine / Chondroitin
- Whey protein
Other checked brands
- Nature Made USP Verified, Informed Choice
- Member's Mark USP Verified
- trunature USP Verified
- Nature's Bounty USP Verified
- Ritual USP Verified
- Culturelle USP Verified
Full verified-brands directory · What these seals do and do not mean