Kirkland Signature Calcium Citrate Magnesium and Zinc

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Common questions

Is Kirkland Signature Calcium Citrate Magnesium and Zinc healthy?

Kirkland Signature Calcium Citrate Magnesium and Zinc scores 72/100 on Scout's independent analysis of ingredients, additives, and lab results — a fair-to-good score — solid, with tradeoffs. This supplement contains beneficial ingredients such as calcium citrate and cholecalciferol, which are known for their high bioavailability and effectiveness in supporting bone health and immune function.

How processed is Kirkland Signature Calcium Citrate Magnesium and Zinc?

Kirkland Signature Calcium Citrate Magnesium and Zinc is NOVA Group 4: Ultra-Processed Foods.

Which ingredients drive Kirkland Signature Calcium Citrate Magnesium and Zinc's score?

In Scout's ingredient-by-ingredient analysis, Calcium Citrate, Magnesium Oxide, Zinc Oxide count in its favor. The full breakdown, with why each one matters, is in the Key ingredients section on this page.

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Kirkland Signature Calcium Citrate Magnesium and Zinc

Kirkland Signature
72 Good

Analysis updated August 2026 · How Scout scores

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Near you

Kirkland Signature is carried at Costco stores. Find one within 25 miles.

At a glance

Beneficial ingredients 7
Harmful ingredients 0
Owned by Costco
Category Vitamins and Minerals
Summary

This supplement contains beneficial ingredients such as calcium citrate and cholecalciferol, which are known for their high bioavailability and effectiveness in supporting bone health and immune function. However, the use of magnesium oxide, which has a lower absorption rate, and the presence of additives like cellulose and magnesium stearate slightly detract from its overall formulation quality. Despite these minor concerns, the product remains a solid choice for those seeking essential minerals and vitamins.

Key ingredients 12

Calcium Citrate
Very Good

Calcium citrate is a highly absorbable form of calcium, essential for bone health and muscle function. It is preferred over other forms due to its better absorption rate, especially in individuals with lower stomach acid. This form of calcium is less likely to cause gastrointestinal discomfort compared to calcium carbonate.

Benefits

Supports bone density and strength, and plays a crucial role in muscle contraction and nerve signaling.

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Cholecalciferol
Very Good

Cholecalciferol, also known as Vitamin D3, is essential for calcium absorption and bone health. It is the preferred form of Vitamin D due to its superior bioavailability and effectiveness in raising blood levels of Vitamin D. This vitamin is crucial for immune function and reducing inflammation.

Risks

Excessive intake can lead to hypercalcemia and kidney damage.

Benefits

Enhances calcium absorption, supports immune health, and promotes bone strength.

Magnesium Oxide
Good

Magnesium oxide is a common form of magnesium used in supplements, known for its role in muscle and nerve function. Although it has a lower absorption rate compared to other forms, it is effective for addressing magnesium deficiency. It is often used for its laxative effect and to relieve indigestion.

Risks

Excessive intake can lead to diarrhea and gastrointestinal discomfort.

Benefits

Essential for energy production, bone health, and maintaining normal muscle and nerve function.

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Zinc Oxide
Good

Zinc oxide is a widely used form of zinc in supplements, important for immune function and wound healing. It is less bioavailable than other forms but still effective in preventing zinc deficiency. Zinc plays a critical role in DNA synthesis and cell division.

Risks

High doses can cause nausea, vomiting, and interfere with copper absorption.

Benefits

Supports immune health, skin integrity, and acts as an antioxidant.

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Manganese Gluconate
Good

Manganese gluconate is a bioavailable form of manganese, essential for bone formation and metabolism. It is used in supplements to support enzyme function and antioxidant defense. Manganese is crucial for the synthesis of connective tissue and blood clotting factors.

Risks

Excessive intake can lead to neurological issues and interfere with iron absorption.

Benefits

Supports bone health, metabolism, and antioxidant protection.

Copper Gluconate
Good

Copper gluconate is a bioavailable form of copper, important for iron metabolism and cardiovascular health. It is used in supplements to prevent copper deficiency, which can lead to anemia and weakened immune function. Copper is essential for the formation of red blood cells and maintaining healthy bones and nerves.

Risks

High doses can cause gastrointestinal distress and liver damage.

Benefits

Supports cardiovascular health, immune function, and iron absorption.

Boron Glycinate
Good

Boron glycinate is a bioavailable form of boron, which supports bone health and hormone regulation. It is used in supplements to enhance the absorption of calcium and magnesium. Boron plays a role in reducing inflammation and improving cognitive function.

Risks

Excessive intake can lead to toxicity and hormonal imbalances.

Benefits

Supports bone density, cognitive function, and hormonal balance.

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Cellulose
Neutral

Cellulose is a plant-derived fiber used as a filler and binder in supplements. It is inert and does not provide nutritional value but aids in the structural integrity of tablets. Cellulose is commonly used in supplements for its ability to add bulk without calories.

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Croscarmellose Sodium
Neutral

Croscarmellose sodium is a disintegrant used in tablets to help them dissolve and release active ingredients. It is considered safe and effective for its intended use in supplements. This ingredient is widely used in the pharmaceutical industry to enhance the bioavailability of active compounds.

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Magnesium Stearate
Neutral

Magnesium stearate is a common flow agent used in supplement manufacturing to prevent ingredients from sticking to equipment. It is generally recognized as safe when used in small amounts. This ingredient helps ensure consistent dosing and quality of the final product.

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Silicon Dioxide
Neutral

Silicon dioxide is used as an anti-caking agent in supplements to prevent clumping. It is considered safe and does not affect the nutritional value of the product. This ingredient is commonly used in food and supplements to maintain product quality.

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Cellulose Coating
Neutral

Cellulose coating is used to provide a protective layer on tablets, aiding in swallowing and stability. It is derived from plant sources and is considered safe for consumption. This coating helps protect the active ingredients from moisture and oxidation.

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Processing

Group 4 · Ultra-processed

Ultra-Processed Foods

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