Copernicia Cerifera Wax

Copernicia Cerifera (carnauba) wax is a high–molecular weight plant wax used mainly as a structurant/occlusive film former in balms, sticks, and creams, typically at a few percent to ~10%. It is generally non-irritating in standard patch testing, but in eczema-prone or highly reactive patients the occlusive film and mechanical friction from wax-heavy products can contribute to stinging or irritant flares, so I rate it very gentle rather than inert. Safety Notes: In commercial skincare, Copernicia Cerifera (Carnauba) Wax is often used at very low levels (~0.05–0.5%) as a structurant/viscosity and stability aid in leave-on creams, lotions, and some rinse-off cleansers. Mid-range use (~1–10%) is common in anhydrous balms, stick products, and rich barrier formulations where it contributes hardness, pay-off control, and water resistance. The highest consumer-available levels are seen in wax-heavy anhydrous sticks/balms and salves (often blended with other waxes/butters), where carnauba can reach ~20–30% to provide rigidity and high melt point; above this is uncommon due to brittleness/drag and processing constraints.