Adipic Acid

Adipic acid is a naturally occurring dicarboxylic acid commonly used in cosmetic formulations as a pH buffer and masking agent. It works to neutralise alkaline ingredients and maintain stable pH levels within a product, which is important for both product stability and skin compatibility.

In skincare, adipic acid serves a functional rather than active role. It does not directly target skin concerns but instead helps ensure that other active ingredients remain effective and that the overall formulation is well-tolerated by the skin.

Adipic acid functions as a buffer by neutralising excess alkalinity in formulations. When a product becomes too alkaline, it can disrupt the skin's natural pH and compromise the effectiveness of active ingredients. Adipic acid donates hydrogen ions to bring the pH into a more skin-friendly range, typically between 4.5 and 5.5.

It also acts as a masking agent, helping to conceal or reduce any unpleasant odour that other ingredients in the formula might contribute, improving the sensory experience of using the product.

Adipic acid is a background ingredient — you will not need to adjust usage based on this component alone. Products containing it can typically be used as directed for the formulation type (serum, moisturiser, etc.). If you are sensitive to acidic products generally, patch test first, though irritation from adipic acid specifically is uncommon at cosmetic concentrations.