Kirkland Signature
6 products scored by Formulate's ingredient-level rubric. Brand grade reflects a weighted average across the full lineup.
Scored by the Formulate Research Team · Last reviewed July 2026
How Kirkland Signature scored
Accurate labels, no proprietary blends hiding doses, consistent sourcing
Ingredient form, bioavailability, dose accuracy across the lineup
Published testing, ingredient origins, full disclosure
USP, NSF, Informed Sport, or comparable third-party testing coverage
New formulations, new forms, research-driven development
Component scores are derived from the product lineup, not from marketing materials. See the methodology page for how each component is computed.
What Kirkland Signature makes
- 2 Minerals
- 1 Adaptogens
- 1 Heart Health
- 1 Fish Oil & Omegas
- 1 Multivitamins
Top-scoring products
Kirkland Signature: frequently asked questions
How does Formulate grade Kirkland Signature?
Formulate grades Kirkland Signature by aggregating the ingredient-level scores of all 6 Kirkland Signature products it has analyzed — weighing dose accuracy, ingredient form, transparency, and third-party testing. Kirkland Signature's overall brand grade is D+ (68/100). It is not a paid or sponsored ranking.
Is Kirkland Signature third-party tested?
Kirkland Signature scores 57/100 on third-party verification — meaning third-party testing coverage is limited across its lineup. Check individual product pages for which specific products are certified.
What is Kirkland Signature's best supplement?
Turmeric 1000 mg, 320 Vegetarian Capsules is Kirkland Signature's highest-scoring product on Formulate at 89/100 (grade A).
What does Kirkland Signature make?
Formulate has scored 6 Kirkland Signature products, including 2 Minerals, 1 Adaptogens, 1 Heart Health, 1 Fish Oil & Omegas, and more.
About the grading
Every Kirkland Signature product above is scored on dose accuracy, ingredient form, certifications, transparency, and third-party testing. The brand grade aggregates those product scores — it isn't a marketing claim or a pay-for-play ranking. See the methodology page for the full rubric.