Sodium Citrate, a sodium salt of citric acid, is a versatile ingredient in cosmetic formulations, primarily valued for its roles as a pH adjuster, chelating agent, and mild preservative. In skincare, it ensures products maintain an optimal pH level, typically around 4.5–5.5, aligning with the skin’s natural acid mantle to prevent irritation and enhance compatibility. Its chelating properties bind to metal ions, such as calcium and magnesium, preventing them from reacting with other ingredients, which could lead to product degradation, discoloration, or reduced efficacy. This is particularly crucial in formulations containing antioxidants or other sensitive actives. Sodium Citrate also exhibits mild preservative properties, inhibiting microbial growth to extend shelf life.

In haircare, Sodium Citrate plays a similar functional role, ensuring shampoos, conditioners, and hair masks maintain a scalp-friendly pH to minimize irritation and support hair health. By stabilizing formulations, it prevents phase separation and maintains the efficacy of active ingredients, ensuring consistent product performance. Its biodegradable nature and natural derivation from citric acid align with consumer demand for eco-friendly products, making it a valuable component in sustainable haircare formulations. Sodium Citrate is commonly used at 0.1%–0.5% in haircare products, often paired with other stabilizers to enhance performance.