Phenol

Phenol is a naturally occurring organic compound that has been used in skincare formulations for over a century. In cosmetics, it serves primarily as a preservative and antimicrobial agent, helping to prevent bacterial and fungal growth within products. It also functions as a denaturant and fragrance component in some formulations.At the concentrations used in skincare products (typically 0–2%), phenol works to maintain product stability and extend shelf life. It is found in a range of skincare and personal care products, though it is less common in modern formulations than some alternative…

Phenol functions as a preservative by inhibiting the growth of bacteria and fungi within cosmetic formulations. Its antimicrobial action works at the cellular level, disrupting microbial metabolism and preventing proliferation. This helps protect the product itself from degradation and maintains its efficacy throughout its shelf life.In formulations, phenol also acts as a denaturant—a substance that alters the properties of other ingredients—and in some cases contributes to fragrance profiles.

Phenol-containing products should be used as directed on the label. Since it functions as a preservative, the ingredient's presence is typically about maintaining product quality rather than requiring specific application techniques. If using a product containing phenol, apply it according to the product instructions and store in a cool, dry place to optimise preservation.

Phenol is generally well-tolerated at the concentrations used in leave-on skincare products. However, at higher concentrations or with prolonged exposure, phenol can cause irritation. Those with sensitive skin should patch test first.