Carbomer in Skincare: Safety Profile, Irritation Potential, and Comedogenicity

Carbomer (polyacrylic acid crosspolymer) is a high-molecular-weight polymer used as a thickener, gelling agent, and stabilizer in cosmetics and topical drugs.

Safety Summary

• CIR (Cosmetic Ingredient Review): Safe as used (≤1–2% typical).
• EWG: Score 1 (low hazard).
• EU/US: Permitted without restriction.

Potential Concerns

• Irritation: Rare at use concentrations; possible in compromised barrier (eczema, rosacea) or with high % + occlusion.
• Allergy: Very rare (case reports only).
• Comedogenicity: Rated 0–1/5 (non-comedogenic to very low). Unlikely to clog pores.
• Interaction: Can bind cationic preservatives (e.g., benzalkonium chloride) → reduced antimicrobial efficacy. Formulators adjust.

Practical Takeaway

For the vast majority, carbomer is inert and well-tolerated. If you have reactive skin, patch-test new products. The vehicle (other ingredients) matters more than carbomer itself.