Back to Ingredient Dictionary

PHENOLSULFONPHTHALEIN

Description

Phenolsulfonphthalein, also known as phenol red, is a pH indicator widely used in laboratory settings and occasionally in skincare formulations. This synthetic organic compound changes color dramatically in response to pH levels, transitioning from yellow in acidic conditions to red in neutral environments, and finally to a vibrant fuchsia in alkaline solutions. In dermatology and cosmetic science, phenolsulfonphthalein serves multiple purposes. It can be utilized as a colorimetric indicator to assess the pH of skincare products during formulation and quality control processes. Some formulators incorporate minute amounts of phenolsulfonphthalein into leave-on products to provide a visual cue of pH changes upon application to the skin. However, its use in final cosmetic products is limited due to potential skin sensitization concerns and strict regulatory guidelines. Phenolsulfonphthalein exhibits low toxicity but may cause mild irritation in some individuals. Its primary value in skincare lies in research and development, where it aids in optimizing product pH for skin compatibility and ingredient stability. When used judiciously, phenolsulfonphthalein contributes to the creation of safer, more effective skincare formulations by ensuring appropriate acidity levels.