Kirkland Signature Calcium Citrate Magnesium and Zinc 500 Tablets

Kirkland Signature
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Near you

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

Summary

This supplement contains beneficial ingredients like calcium citrate and cholecalciferol, which are known for their high bioavailability and essential roles in bone health. However, the inclusion of boric acid, which can be toxic in high amounts, raises concerns. The presence of multiple additives, although not excessive, also slightly impacts the overall formulation quality.

At a glance

Beneficial ingredients 9
Harmful ingredients 1
Owned by Costco
Category Vitamins And Minerals

Key ingredients 13

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 makes it a superior choice for maintaining adequate calcium levels.

Benefits

Supports bone density and reduces the risk of osteoporosis.

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Magnesium Oxide
Good

Magnesium oxide is a common form of magnesium used in supplements, known for its high magnesium content per weight. 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 support muscle and nerve function.

Risks

May cause gastrointestinal discomfort or diarrhea in high doses.

Benefits

Supports muscle and nerve function, and helps maintain normal blood pressure.

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Calcium Carbonate
Good

Calcium carbonate is a widely used calcium supplement due to its high elemental calcium content. It is effective for those who can tolerate it, although it requires stomach acid for absorption. It is a cost-effective option for increasing calcium intake.

Risks

May cause constipation or bloating in some individuals.

Benefits

Helps maintain strong bones and teeth.

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Magnesium Stearate
Neutral

Magnesium stearate is commonly used as a flow agent in supplement manufacturing. It ensures even distribution of ingredients in tablets and capsules. While it is generally considered safe, some concerns exist about its potential to inhibit nutrient absorption.

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Silicon Dioxide
Neutral

Silicon dioxide is used as an anti-caking agent in supplements to prevent clumping. It is a naturally occurring compound found in many foods and is generally recognized as safe. It does not contribute any nutritional value to the supplement.

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Cellulose Coating
Neutral

Cellulose coating is used to provide a protective layer on tablets, aiding in their stability and ease of swallowing. It is derived from plant fibers and is considered safe for consumption. It does not affect the nutritional profile of the supplement.

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Zinc Oxide
Good

Zinc oxide is a common form of zinc used in supplements, known for its role in immune function and wound healing. It is an effective way to increase zinc intake, although it has a lower absorption rate compared to other forms. It is crucial for maintaining a healthy immune system.

Risks

Excessive intake may lead to zinc toxicity, causing nausea and immune dysfunction.

Benefits

Supports immune function and skin health.

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Manganese Gluconate
Good

Manganese gluconate is a bioavailable form of manganese, important for bone formation and metabolic processes. It is used in supplements to support enzyme function and bone health. Manganese is essential for the synthesis of connective tissue.

Risks

High doses may lead to neurological issues.

Benefits

Supports bone health and enzyme function.

Copper Gluconate
Good

Copper gluconate is a form of copper used in supplements to support cardiovascular and immune health. It is essential for iron metabolism and the formation of red blood cells. Copper is also important for maintaining healthy connective tissues.

Risks

Excessive copper intake can lead to toxicity, causing liver damage.

Benefits

Supports cardiovascular health and iron metabolism.

Boric Acid
Bad

Boric acid is sometimes used in supplements for its potential health benefits, but it is not essential for human nutrition. It can be toxic in high amounts and is not typically recommended for supplementation. Its inclusion in supplements is controversial due to potential health risks.

Risks

Toxic in high doses, potentially causing reproductive and developmental harm.

Glycine
Good

Glycine is an amino acid that supports collagen production and has calming effects on the brain. It is used in supplements for its potential to improve sleep quality and joint health. Glycine also plays a role in detoxification processes.

Benefits

Supports collagen production and improves sleep quality.

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Cholecalciferol
Very Good

Cholecalciferol, or Vitamin D3, is crucial for calcium absorption and bone health. It is the preferred form of Vitamin D due to its superior bioavailability compared to Vitamin D2. Adequate Vitamin D levels are essential for immune function and overall health.

Risks

Excessive intake can lead to hypercalcemia, causing nausea and kidney issues.

Benefits

Enhances calcium absorption and supports immune health.

Pyridoxine Hydrochloride
Good

Pyridoxine hydrochloride is a form of Vitamin B6, important for protein metabolism and cognitive development. It is used in supplements to support brain health and energy metabolism. Vitamin B6 is essential for neurotransmitter synthesis.

Risks

High doses may cause nerve damage.

Benefits

Supports brain health and energy metabolism.

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Processing

Group 4 · Ultra-processed

Ultra-Processed Foods

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