Bismuth subcarbonate

Bismuth subcarbonate (CAS 5892-10-4) is an inorganic bismuth salt also known as bismuthyl carbonate, bismuth oxycarbonate, and Bismuthi Subcarbonas. It carries no assigned E-code and is identified under EC number 227-567-9. The compound is used in pharmaceutical and cosmetic formulations where controlled bismuth ion release is required.

In pharmaceutical applications, bismuth subcarbonate acts as a mild antimicrobial and gastrointestinal protective agent, with bismuth ions disrupting bacterial enzyme activity and forming a protective mucosal layer. In cosmetic formulations, it functions as an opacifying colorant, contributing whiteness and coverage to topical products such as creams and powders.

Bismuth subcarbonate is available in pharmaceutical-grade form compliant with Ph.Eur. monograph specifications and is subject to REACH registration requirements for EU supply. It is supplied as a fine white powder, typically in multi-layer paper or fibre drum packaging. Buyers should confirm grade suitability against their specific pharmacopoeial or cosmetic regulatory requirements.