Zinc Carbonate

Zinc carbonate is an inorganic zinc salt used as an opacifier/pigment and mild skin protectant-type powder in leave-on and rinse-off products, generally at low percentages. Like other insoluble zinc salts, it is typically well tolerated and not a common irritant in patch testing, but particulate powders can cause mild mechanical irritation or dryness in very reactive or eczematous skin, especially with frequent use or compromised barriers. Given this small but real risk in highly sensitive populations, it fits best as a gentle, generally well-tolerated ingredient rather than exceptionally gentle. Safety Notes: In commercial skincare, zinc carbonate is most often used as a minor opacifying/absorbent or skin-protective mineral, where it can appear at low levels (~0.05–0.5%) in emulsions, lotions, and cleansers to tweak sensorial feel and reduce shine. At the high end, it is found in consumer-available mineral barrier creams, anti-chafe/diaper-rash style protectants, and some powder-to-cream mattifying products where total insoluble mineral load is high; zinc carbonate can be present in the ~10–25% range (typically in leave-on pastes/creams rather than rinse-off). Zinc carbonate is not specifically concentration-capped in major cosmetic regulations like the EU Cosmetics Regulation in the way zinc oxide is for UV-filtering, so practical upper limits are driven mainly by aesthetics, viscosity, and stability/dispersion rather than a strict legal maximum.