Calcite

Calcite is a naturally occurring mineral compound of calcium carbonate. In skincare, it appears as a fine white powder and functions as a skin conditioning agent. Its porous structure and absorbent properties make it useful in protective and barrier-supporting formulations, particularly in products designed to shield skin from prolonged moisture exposure.The ingredient is inert on skin and has been used in dermatological products for several decades, especially in protective ointments for healthcare settings where moisture management is a clinical concern.

Calcite works through its physical absorbent properties. The mineral's porous structure allows it to draw moisture away from the skin surface, which is particularly useful in protecting skin from damage caused by prolonged or repeated moisture exposure. Unlike occlusive ingredients such as petrolatum, calcite permits some degree of moisture vapour transmission, meaning skin can still breathe whilst remaining protected.

Calcite is typically used in creams, pastes and protective ointments rather than serums or lightweight formulations. It is most beneficial in products designed for barrier protection or moisture management. Look for it in formulations targeting sensitive or compromised skin, particularly in healthcare or professional skincare contexts.

Calcite is generally well-tolerated and poses minimal risk of irritation or sensitisation. It is inert and non-toxic. Those with known sensitivity to mineral powders should patch test first.