Alpha Arbutin 2% + HA is a water-based serum specifically designed to target uneven skin tone and visibly improve pigmentation. It combines a high concentration of purified alpha arbutin, a well-known skin-brightening ingredient, with hyaluronic acid. Purified alpha-arbutin works to target dark spots and uneven skin tone. Meanwhile, hyaluronic acid helps to support product absorption into the skin. Note: Alpha Arbutin is extremely sensitive to degradation in the presence of water if the pH of the formulation is not ideal. The pH of this formula has been shown to be the most suitable pH to minimize degradation of Alpha Arbutin. We are aware of the potential colour changes of our Alpha Arbutin product. This is a natural occurrence, where certain ingredients in the product can change colour when exposed to sunlight or increased temperature. Testing has shown that the efficacy and safety profile of the active ingredient remains stable.