SODIUM CITRATE.

Sodium Citrate primarily functions as a precise pH adjuster and buffering agent, enabling cosmetic products to sustain an optimal pH level. This typically aligns with the skin's natural acid mantle (pH 4.5-5.5) but can effectively buffer solutions across a broader range of 3.0 to 6.2, preventing potential irritation and enhancing product compatibility. Concurrently, it acts as a potent chelating agent by binding to metal ions, such as calcium and magnesium, which might otherwise catalyze product degradation, discoloration, and diminish the efficacy of sensitive active ingredients and antioxidants. The ingredient also contributes mild preservative properties, inhibiting microbial proliferation and extending shelf life, often acting as a preservative booster. Additional benefits include potential antioxidant effects, contributing to protection against premature aging, and assisting other antioxidants in formulations. It may also function as a humectant to support skin hydration, a masking agent to neutralize undesirable odors, and potentially enhance the penetration of other beneficial compounds into the skin.