Tropolone

Tropolone is an aromatic monohydroxyketone used in cosmetic formulas as a preservative with some metal-chelating ability. It's selected to extend shelf life and improve stability by curbing microbial growth in water-rich products.
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Ingredient Snapshot

Overview
A preservative that binds metals and helps products last longer.
Category
Preservative
Type
Preservative

Ingredient Ratings

Overall Rating

Fair

Comedogenic Risk

None

Skin Benefits

Reduces product spoilage that can degrade texture and scent, and adds preservative support in formulas with higher contamination risk.

Uses In Skincare & Cosmetics

Commonly included in lotions, gels, and shampoos as a preservative; also used in water-heavy serums to maintain product quality.

Comedogenic Rating

This ingredient is not typically evaluated for comedogenicity, and no standardized rating is available.

Safety

Generally safe at low cosmetic use levels, though it may irritate eyes or compromised skin and can cause mild stinging in sensitive users. Patch testing is prudent for very reactive skin.

Is Tropolone a Good Ingredient?

It rates Fair because, while it offers preservative support, its broad-spectrum efficacy and stability within a formula are modest compared with established systems, and at higher levels it can sting or trigger sensitization in delicate areas.

Products with Tropolone

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