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Kirkland Signature Heavy-Duty Laundry Detergent Super Concentrate

Common questions

Is Kirkland Signature Heavy-Duty Laundry Detergent Super Concentrate healthy?

Kirkland Signature Heavy-Duty Laundry Detergent Super Concentrate scores 91/100 on Scout's independent analysis of ingredients, additives, and lab results — one of the stronger scores in Scout's catalog. Kirkland Signature Heavy-Duty Laundry Detergent Super Concentrate scores 91/100.

How does Kirkland Signature Heavy-Duty Laundry Detergent Super Concentrate compare to other laundry?

Kirkland Signature Heavy-Duty Laundry Detergent Super Concentrate ranks #8 of 17 laundry in Scout's independent rankings. The current top score in the category is Lysol Laundry Sanitizer Free & Clear at 96/100.

Which ingredients drive Kirkland Signature Heavy-Duty Laundry Detergent Super Concentrate's score?

In Scout's ingredient-by-ingredient analysis, Natural Fragrance, Biodegradable Formula count in its favor; Optical Brighteners is flagged as an ingredient 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 Heavy-Duty Laundry Detergent Super Concentrate

Costco Wholesale Corporation
Scout Pick
91 Excellent
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At a glance

Beneficial ingredients 2
Harmful ingredients 1
Owned by Costco Wholesale Corporation
Category Laundry
Summary

Kirkland Signature Heavy-Duty Laundry Detergent Super Concentrate scores 91/100. Highlights include biodegradable.

Key ingredients 3

Natural Fragrance
Good

Scented with natural essential oils or plant-derived ingredients rather than synthetic fragrance chemicals.

See more about Natural Fragrance →
Biodegradable Formula
Good

Biodegradable ingredients break down naturally in the environment, reducing aquatic toxicity and long-term ecosystem impact.

See more about Biodegradable Formula →
Optical Brighteners
Bad

Optical brighteners are synthetic chemicals that coat fabric to make it appear whiter under UV light. They do not rinse out fully, remain on skin-contact fabric, and are not readily biodegradable.

See more about Optical Brighteners →

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