An active serum to renew the skin by producing a controlled and soft exfoliation with 2% of XS hyaluronic acid and 5% of PHA. PHA have numerous skin care benefits, not causing any irritation to the skin. Because of the multiple hydroxyl groups, they are strong humectant and keep the skin glow and plumped. PHA treat the skin very gently without affecting deeper layers. The effect is very similar to that of AHAs (alpha hydroxy acids or fruit acids like glycolic or lactic acid), but as a type of polyhydroxy acid they are more beneficial. Since it is a larger molecule, they penetrate the skin slowly without burning it like the other exfoliating agents. PHA when used alone don't require the application of a , after the treatment.