Esthetics Core Written Practice Test

Glycolic acid is commonly included in exfoliating products due to its powerful effectiveness as an alpha hydroxy acid (AHA). It helps to dissolve the bonds that hold dead skin cells together on the surface of the skin, promoting cell turnover and revealing fresher, smoother skin underneath. This process not only aids in improving the texture and appearance of the skin but also enhances the absorption of other skincare ingredients, making them more effective.

The other ingredients mentioned serve different purposes. Lanolin is primarily a moisturizer and does not have exfoliating properties. Fragrance is often added for scent, but it does not contribute to the exfoliating action. Petrolatum is a skin protectant and occlusive agent used to lock in moisture rather than to exfoliate. Thus, glycolic acid stands out for its direct role in the exfoliation process.