Kirkland Signature CoQ10 300mg 100 Softgels supplement bottle
Kirkland Signature

CoQ10 300mg 100 Softgels Review

What We Researched
1 active ingredient analyzed · 6 inactive ingredients decoded · 4 brand certifications checked · Last updated: Aug 2026
100
Product Score Excellent
80
Brand Score Good

Two independent scores — the product and the brand behind it, never blended into one number. See our methodology.

Product Analysis

Transparency Excellent

Supplement Facts

IngredientAmount% DV
Coenzyme Q10 300 mg
Bioavailability Excellent

Absorption Rating

  • Coenzyme Q10 Good
Other Ingredients Excellent

Fillers & Additives

  • Soybean Oil
  • Coenzyme Q10 (Ubidecarenone)
  • Gelatin (Bovine)
  • Glycerin
  • Soy Lecithin
  • Silica
Efficacy Excellent

Dosage Analysis

  • Coenzyme Q10 300 mg Effective

Supplement Facts

Ingredient Amount % Daily Value
Coenzyme Q10 300 mg

Other Ingredients

Inactive ingredients used in manufacturing. All rated for safety.

Soybean Oil Safe

Dissolves fat-soluble ingredients. Contains soy allergen.

Coenzyme Q10 (Ubidecarenone) Unknown
Gelatin (Bovine) Safe

It is used to make capsules.

Glycerin Safe

Retains moisture and helps dissolve ingredients in softgels and liquids.

Soy Lecithin Safe

Helps blend oil and water-based ingredients. Common allergen.

Silica Safe

Prevents ingredients from clumping and improves powder flow.

Brand Trust Report
Kirkland Signature

Founded 1995 · Issaquah, Washington, United States · 56 products · costco.com/kirkland-signature.html

Certifications

4 certifications
Usp Verified Verified Source
Informed Choice Verified
USDA Organic Verified
Gluten-Free Certified Verified

Transparency

5 claims
Third Party Testing Claim — Verified Source
Testing Lab Disclosure — Claimed
In House Testing — Claimed
Contains Proprietary Blend — True

Violation History

3 incidents
Lawsuit Falsely advertising rotisserie chicken as containing 'no preservatives'2026Source
Recall Kirkland Signature B100 Complex Timed Release2025-03-31Source
Recall Kirkland Signature Severe Cold and Flu Plus Congestion2024-11-30Source
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Frequently Asked Questions
Is Kirkland Signature CoQ10 300mg 100 Softgels a good supplement?

Kirkland Signature CoQ10 300mg 100 Softgels received a product quality score of 100/100 in GoodSupp's independent analysis, placing it in the top tier of supplements we've analyzed. The product contains 1 active ingredients Of the 6 inactive ingredients, 5 are rated safe and 0 are flagged for review. The manufacturer, Kirkland Signature, holds a brand trust score of 80/100 with 4 verified certifications including Usp Verified, Informed Choice, USDA Organic, Gluten-Free Certified.

What are the ingredients in Kirkland Signature CoQ10 300mg 100 Softgels?

Kirkland Signature CoQ10 300mg 100 Softgels contains 1 active ingredients: Coenzyme Q10 (300 mg). Each ingredient's dosage, form, and safety rating is analyzed independently in GoodSupp's full product breakdown.

Is Kirkland Signature CoQ10 300mg 100 Softgels safe to take?

Kirkland Signature CoQ10 300mg 100 Softgels has been analyzed for ingredient safety across all its components. Always consult your healthcare provider before starting any new supplement, especially if you take medications or have underlying health conditions.

Is Kirkland Signature a trustworthy supplement brand?

Kirkland Signature receives a brand trust score of 80/100 based on GoodSupp's independent analysis of certifications, regulatory history, and transparency practices. Founded in 1995 and headquartered in Issaquah, Washington, United States, the company offers 56 products in their lineup. They hold 4 verified certifications including Usp Verified, Informed Choice, USDA Organic, Gluten-Free Certified. Third-party certifications are independently verified and indicate the brand meets specific quality, purity, and manufacturing standards. Note: Kirkland Signature has 3 historical regulatory incidents on record, which are factored into the trust score.

What is coq10?

Coq10 is a topic many supplement consumers ask about. In the context of dietary supplements, understanding coq10 helps you make more informed choices about what you put in your body. The quality and form of ingredients matters significantly — two products listing the same ingredient can differ dramatically in bioavailability and effectiveness. GoodSupp analyzes over 150,000 supplement products to help consumers understand exactly what's in their supplements and whether the formulation meets quality standards.

What is coq10 good for?

Coq10 Good For is a topic many supplement consumers ask about. In the context of dietary supplements, understanding coq10 good for helps you make more informed choices about what you put in your body. The quality and form of ingredients matters significantly — two products listing the same ingredient can differ dramatically in bioavailability and effectiveness. GoodSupp analyzes over 150,000 supplement products to help consumers understand exactly what's in their supplements and whether the formulation meets quality standards.

How much coq10 should i take?

The optimal dosage depends on your individual health needs, age, sex, and current nutrient levels. Recommended daily amounts are established by health authorities but may vary from therapeutic doses used in clinical research. It's important to check the Supplement Facts label for the exact amount per serving and compare it against the % Daily Value. Some supplements provide mega-doses well above the Daily Value, which may not be necessary and in some cases could be harmful — particularly for fat-soluble vitamins (A, D, E, K) that accumulate in the body. GoodSupp's efficacy analysis evaluates whether a product's dosages align with clinically studied amounts. Always consult your healthcare provider for personalized dosage recommendations.

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Disclaimer: GoodSupp provides independent supplement quality analysis for informational purposes only. Scores are generated algorithmically based on ingredient profiles, brand certifications, and public records — read our methodology. This is not medical advice. Always consult a healthcare professional before starting any supplement regimen. Product data is sourced from manufacturer labels and public databases. GoodSupp is not affiliated with any supplement brand.