Kirkland Signature Chewable Vitamin C 500 mg. 500 Tablets

Common questions

Is Kirkland Signature Chewable Vitamin C 500 mg. 500 Tablets healthy?

Kirkland Signature Chewable Vitamin C 500 mg. 500 Tablets scores 62/100 on Scout's independent analysis of ingredients, additives, and lab results — a fair-to-good score — solid, with tradeoffs. This chewable vitamin C supplement contains beneficial forms of vitamin C, such as sodium ascorbate and ascorbic acid, which are known for their antioxidant properties and immune support.

How processed is Kirkland Signature Chewable Vitamin C 500 mg. 500 Tablets?

Kirkland Signature Chewable Vitamin C 500 mg. 500 Tablets is NOVA Group 4: Ultra-Processed Foods.

Which ingredients drive Kirkland Signature Chewable Vitamin C 500 mg. 500 Tablets' score?

In Scout's ingredient-by-ingredient analysis, Sodium Ascorbate, Ascorbic Acid count in its favor; Natural Orange Flavor, Sucralose, Maltodextrin are flagged as ingredients of concern. The full breakdown, with why each one matters, is in the Key ingredients section on this page.

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Kirkland Signature Chewable Vitamin C 500 mg. 500 Tablets

Kirkland Signature
Bioengineered
62 Fair

Analysis updated July 2026 · How Scout scores

500 count
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Near you

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

At a glance

Beneficial ingredients 2
Harmful ingredients 3
Owned by Costco
Category Immunity
Summary

This chewable vitamin C supplement contains beneficial forms of vitamin C, such as sodium ascorbate and ascorbic acid, which are known for their antioxidant properties and immune support. However, the presence of sucralose, an artificial sweetener, and maltodextrin, a processed carbohydrate, detracts from its overall quality. Additionally, the use of natural orange flavor without transparency about its specific components raises concerns about ingredient clarity.

Key ingredients 13

Sodium Ascorbate
Good

Sodium ascorbate is a form of Vitamin C that is more easily absorbed by the body compared to ascorbic acid alone. It provides antioxidant benefits and supports immune function. It is often used in supplements for its enhanced bioavailability.

Benefits

Enhances immune function and provides antioxidant protection, supporting overall health.

See more about Sodium Ascorbate →
Ascorbic Acid
Good

Ascorbic acid is a pure form of Vitamin C, essential for collagen synthesis and immune support. It is a well-known antioxidant that helps protect cells from damage. Commonly used in supplements to boost Vitamin C intake.

Risks

High doses may cause gastrointestinal discomfort, such as diarrhea or nausea.

Benefits

Supports immune health and acts as a powerful antioxidant, protecting against oxidative stress.

See more about Ascorbic Acid →
Sorbitol
Neutral

Sorbitol is a sugar alcohol used as a sweetener and humectant in food products. It is generally considered safe but can cause digestive issues in large amounts. It is a common ingredient in sugar-free products.

Risks

Excessive consumption may lead to gastrointestinal discomfort, including bloating and diarrhea.

Benefits

Provides sweetness with fewer calories than sugar, making it useful in low-calorie products.

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Corn Starch
Neutral

Corn starch is used as a filler and thickening agent in many food products. It is a refined carbohydrate with minimal nutritional value. Commonly used in processed foods for texture and stability.

Benefits

Provides texture and stability to the product without significant nutritional benefits.

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Magnesium Stearate
Neutral

Magnesium stearate is a common additive used as a flow agent in supplement manufacturing. It helps prevent ingredients from sticking to equipment. It is generally recognized as safe in small amounts.

Benefits

Improves manufacturing efficiency by preventing clumping and ensuring even distribution of ingredients.

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Silicon Dioxide
Neutral

Silicon dioxide is used as an anti-caking agent to prevent clumping in powdered products. It is a naturally occurring compound found in the earth's crust. Widely used in food and supplements for its functional properties.

Benefits

Prevents clumping and ensures consistent texture in powdered products.

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Orange Juice Powder
Neutral

Orange juice powder is derived from dehydrated orange juice and used for flavoring. It retains some nutrients from the original fruit but in reduced amounts. Commonly used in supplements for its natural flavor and vitamin content.

Benefits

Adds natural flavor and a small amount of Vitamin C to the product.

Lactose
Neutral

Lactose is a sugar found in milk and used as a filler in supplements. It is generally well-tolerated but can cause issues for those with lactose intolerance. Used in small amounts in supplements for its binding properties.

Risks

May cause digestive discomfort in individuals with lactose intolerance.

Benefits

Acts as a filler and binder, contributing to the product's texture and stability.

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Annatto Extract
Neutral

Annatto extract is a natural colorant derived from the seeds of the achiote tree. It is used to impart a yellow to orange color in foods. Considered safe and natural, it is a common alternative to synthetic dyes.

Benefits

Provides natural coloring without the use of synthetic dyes.

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Potassium Hydroxide
Neutral

Potassium hydroxide is used in food processing to adjust pH levels. It is a strong alkaline compound used in small amounts. Commonly used in food processing for its functional properties.

Benefits

Helps maintain the desired pH level in food products, ensuring stability and safety.

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Natural Orange Flavor
Bad

Natural orange flavor is a catch-all term for flavoring agents derived from natural sources. It lacks transparency about specific ingredients and processing methods. Often used to enhance taste without providing nutritional benefits.

Risks

Potential for undisclosed additives or allergens, and lack of transparency in ingredient sourcing.

Benefits

Enhances the flavor profile of the product, making it more palatable.

Sucralose
Bad

Sucralose is an artificial sweetener used to provide sweetness without calories. It is much sweeter than sugar and used in small amounts. Concerns exist about its impact on gut health and potential metabolic effects.

Risks

May affect gut microbiota and has been linked to potential metabolic changes.

Benefits

Provides sweetness without adding calories, useful for low-calorie and sugar-free products.

See more about Sucralose →
Maltodextrin
Bad

Maltodextrin is a highly processed carbohydrate used as a filler and thickener. It has a high glycemic index and can affect blood sugar levels. Commonly used in processed foods for texture and bulk.

Risks

May cause spikes in blood sugar levels and is a highly processed ingredient.

Benefits

Provides bulk and texture to products, but offers minimal nutritional benefits.

See more about Maltodextrin →

Processing

Group 4 · Ultra-processed

Ultra-Processed Foods

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