Biguanide

Biguanide refers to a class of water-soluble antimicrobial preservatives used in personal care products. It controls microbial growth and extends shelf life, though tolerability varies and some members face region-specific concentration limits.
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Ingredient Snapshot

Overview
A class of preservatives that stop microbes from growing in products.
Category
Preservative
Type
Preservative

Ingredient Ratings

Overall Rating

Fair

Comedogenic Risk

None

Skin Benefits

Helps keep products usable for longer by resisting contamination and spoilage; sensitivity can vary by individual, and regulatory limits may apply by region.

Uses In Skincare & Cosmetics

Used at low levels in water-based formulas like toners, gels, and cleansers to maintain product freshness, and also found in wipes and leave-on lotions where strong preservation is needed.

Comedogenic Rating

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

Safety

Irritation and sensitization can occur, particularly in leave-on or high-exposure products, so patch testing is prudent for reactive skin. Some biguanide preservatives are subject to specific concentration limits in certain regions, so compliant use levels matter.

Is Biguanide a Good Ingredient?

It's effective for broad-spectrum preservation at low levels, but a higher risk of irritation or sensitization, along with region-specific concentration limits, tempers its usefulness and keeps it at Fair. Performance depends on precise dosing and may not suit very sensitive skin.

Products with Biguanide

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