Lactic acid 10% + HA is an alpha hydroxy acid solution that provides effective exfoliation on the skin surface. It is supported by purified Tasmanian pepper extract that has been proven to reduce irritation and sensitivities that may be associated with the use of acids. This water-based serum is ideal for dry skin. The pH of this formula is about 3.8. Lactic acid has a pKa value of 3.8 and the pKa value is the most important aspect to consider when formulating with acids. pKa implies the availability of acid. When the pKa value is close to pH, there is an ideal balance between salt and acid, maximising the effectiveness of the acid and reducing irritation. The ordinary scrub with lactic acid 10% + HA 2% 30 ml original product. Brightening vitamin C formula with HA balls. Herbal Skin Care/Scrubs Vegan pH 3.60-3.80 Objective: Uneven skin tone, structural irregularities, dullness abroad and may differ from local products, including fit, age rating, and language of the product, labeling or instructions.