Cera Microcristallina

Cera Microcristallina (microcrystalline wax) is an inert occlusive/structuring agent used at moderate to high levels in balms and sticks, with very low intrinsic irritancy in patch testing and long cosmetic history. The main safety concern in highly eczema-prone users is not direct irritation but occasional follicular occlusion or intolerance in leave-on, heavy formulations; true allergic reactions are uncommon. Given its generally excellent tolerability yet nonzero risk in reactive skin when used in high-occlusive routines, it aligns best with a very gentle score. Safety Notes: Cera Microcristallina (microcrystalline wax) is used at very low levels (~0.1–1%) as a viscosity/structure aid in emulsions and leave-on creams/lotions where it mainly boosts body and stability. Mid-range use (2–15%) is common in anhydrous balms, pomades, and stick products for payoff and occlusive film formation. The highest consumer OTC levels (~20–40%) are observed in very waxy anhydrous sticks and heavy barrier balms/ointments (lip balms, salves, deodorant/antiperspirant sticks), where it functions as a primary structurant; rinse-off products typically sit at the low end because high wax loads impair wash-off and sensorials.