Kirkland Signature Calcium Citrate Magnesium and Zinc supplement bottle
Kirkland Signature

Calcium Citrate Magnesium and Zinc

What We Researched
· 13 inactive ingredients decoded · 6 brand certifications checked · Last updated: Mar 2026
71
Product Score Fair
82
Brand Score Good

Product Analysis

Transparency Fair

Supplement Facts

No supplement facts data available.

Bioavailability N/A

Absorption Rating

No ingredient forms matched our reference database.

Other Ingredients Good

Fillers & Additives

  • Calcium Citrate
  • Magnesium Oxide
  • Calcium Carbonate
  • Magnesium Stearate
  • Silicon Dioxide
  • Cellulose Coating
  • Zinc Oxide
  • Manganese Gluconate
  • Copper Gluconate
  • Boric Acid High
  • Glycine
  • Cholecalciferol
  • Pyridoxine Hydrochloride
Efficacy N/A

Dosage Analysis

Dosage data not available for assessment.

Other Ingredients

Inactive ingredients used in manufacturing. All rated for safety.

Calcium Citrate Safe

It provides a source of calcium.

Magnesium Oxide Generally_safe

It is used to provide magnesium, an essential mineral.

Calcium Carbonate Safe

Acts as a filler and provides supplemental calcium.

Magnesium Stearate Safe

Prevents ingredients from sticking to manufacturing equipment during tableting.

Silicon Dioxide Safe

Prevents clumping and ensures consistent dosing.

Cellulose Coating Generally_safe

It is used to coat tablets or capsules for easier swallowing or to control release.

Zinc Oxide Generally_safe

It is used as a source of zinc.

Manganese Gluconate Generally_safe

It is used as a source of manganese.

Copper Gluconate Generally_safe

It is used to provide copper as a dietary supplement.

Boric Acid Avoid

It is used to prevent microbial growth and extend the shelf life of supplements.

Glycine Safe
Cholecalciferol Safe

It is used to supplement vitamin D levels.

Pyridoxine Hydrochloride Safe

It is used as a source of vitamin B6.

Brand Trust Report
Kirkland Signature

Founded 1995 · Issaquah, Washington, United States · 26 products · costco.com/kirkland-signature.html

Certifications

6 certifications
Consumerlab Verified
Non Gmo Project Verified
Usda Organic Verified
Usp Verified Verified Source
Gluten Free Gfco Verified
Vegan Certified Verified

Transparency

4 claims
Third Party Testing Claim — Verified Source
Testing Lab Disclosure — Claimed
In House Testing — Claimed

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 Calcium Citrate Magnesium and Zinc a good supplement?

Kirkland Signature Calcium Citrate Magnesium and Zinc received a product quality score of 71/100 in GoodSupp's independent analysis, suggesting some areas that could be improved. Of the 13 inactive ingredients, 7 are rated safe and 0 are flagged for review. The manufacturer, Kirkland Signature, holds a brand trust score of 82/100 with 6 verified certifications including Consumerlab, Non Gmo Project, Usda Organic, Usp Verified.

Is Kirkland Signature Calcium Citrate Magnesium and Zinc safe to take?

Kirkland Signature Calcium Citrate Magnesium and Zinc 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 82/100 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 26 products in their lineup. They hold 6 verified certifications including Consumerlab, Non Gmo Project, Usda Organic, Usp Verified. 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 magnesium good for?

Magnesium Good For is a topic many supplement consumers ask about. In the context of dietary supplements, understanding magnesium 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 250,000 supplement products to help consumers understand exactly what's in their supplements and whether the formulation meets quality standards.

How much magnesium per day?

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.

What is zinc good for?

Zinc Good For is a topic many supplement consumers ask about. In the context of dietary supplements, understanding zinc 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 250,000 supplement products to help consumers understand exactly what's in their supplements and whether the formulation meets quality standards.

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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. 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.