Kirkland Signature Adult 50+ Mature Multi Vitamins & Minerals 400 Tablets
KirklandAnalysis updated August 2026 · How Scout scores
At a glance
Summary
This multivitamin contains several beneficial ingredients such as Vitamin D3, Zinc Oxide, and Folic Acid, which are important for bone health, immune function, and DNA synthesis. However, the presence of additives like Magnesium Stearate and Polyethylene Glycol, which are controversial due to potential absorption issues and synthetic nature, slightly detracts from its overall quality. The formulation includes a moderate number of additives, which impacts its processing level, but it remains a viable option for those seeking a comprehensive vitamin and mineral supplement.
Key ingredients 13
Dibasic Calcium PhosphateGood
Dibasic Calcium Phosphate provides both calcium and phosphorus, essential minerals for bone health. It is often used as a dietary supplement due to its high bioavailability. The combination of calcium and phosphorus supports bone mineralization.
Risks
High doses may cause gastrointestinal discomfort or interfere with the absorption of other nutrients.
Benefits
Contributes to bone strength and structural integrity.
Zinc OxideGood
Zinc Oxide is a source of zinc, an essential mineral important for immune function and wound healing. It is commonly used in supplements due to its stability and effectiveness. Zinc plays a critical role in cellular metabolism and enzyme function.
Risks
Excessive zinc intake can interfere with copper absorption and cause gastrointestinal distress.
Benefits
Enhances immune response and supports skin health.
Vitamin D3Good
Vitamin D3 (Cholecalciferol) is a highly effective form of vitamin D that supports calcium absorption and bone health. It is crucial for maintaining healthy bones and immune function. Vitamin D3 is more potent and better absorbed than other forms of vitamin D.
Risks
Excessive intake can lead to hypercalcemia, a condition with elevated calcium levels in the blood.
Benefits
Promotes bone health and supports immune system function.
NiacinamideGood
Niacinamide is a form of vitamin B3 that supports energy metabolism and skin health. It is used in supplements to improve cholesterol levels and reduce inflammation. Niacinamide is preferred over niacin for its lower risk of causing flushing.
Risks
High doses can cause liver damage and gastrointestinal issues.
Benefits
Supports energy production and maintains healthy skin.
Calcium CarbonateNeutral
Standard formulation ingredient — neither beneficial nor harmful at typical use.
Risks
Excessive intake may lead to kidney stones or impaired absorption of other minerals.
Benefits
Supports bone density and strength, essential for preventing osteoporosis.
Potassium ChlorideNeutral
Standard formulation ingredient — neither beneficial nor harmful at typical use.
Risks
Excessive potassium intake can lead to hyperkalemia, a condition that affects heart rhythm.
Benefits
Supports cardiovascular health and helps regulate blood pressure.
Magnesium OxideNeutral
Magnesium Oxide is a common form of magnesium used in supplements, though it has lower bioavailability compared to other forms. It is used to support muscle and nerve function. While it is an economical source of magnesium, its absorption rate is relatively low.
Risks
May cause gastrointestinal issues such as diarrhea in high doses.
Benefits
Supports muscle relaxation and nerve function.
Folic AcidNeutral
Standard formulation ingredient — neither beneficial nor harmful at typical use.
Risks
High doses may mask vitamin B12 deficiency symptoms.
Benefits
Supports healthy fetal development and red blood cell formation.
Silicon DioxideNeutral
Silicon Dioxide is used as an anti-caking agent in supplements to prevent clumping. It is generally recognized as safe and does not contribute significant nutritional value. Silicon dioxide is inert and does not react with other ingredients.
See more about Silicon Dioxide →Magnesium StearateNeutral
Standard formulation ingredient — neither beneficial nor harmful at typical use.
Risks
May interfere with the absorption of nutrients in high amounts.
HypromelloseNeutral
Hypromellose is used as a coating agent and to control the release of active ingredients in supplements. It is a cellulose derivative and is generally considered safe. Hypromellose is often used in vegetarian capsules as an alternative to gelatin.
See more about Hypromellose →Copper SulfateBad
Processed additive flagged under Scout's ingredient doctrine.
Risks
High levels of copper can lead to toxicity, causing liver damage and gastrointestinal issues.
Benefits
Supports cardiovascular health and aids in iron absorption.
Polyethylene GlycolBad
Polyethylene Glycol is used as a solvent and to improve the texture of supplements. It is a synthetic compound that can cause gastrointestinal discomfort in some individuals. Its use in supplements is often debated due to its synthetic nature.
Risks
May cause gastrointestinal issues such as bloating and diarrhea.
Processing
Ultra-Processed Foods
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