Well, both the YW skin whitening day cream and the YW skin whitening night cream have been formulated with Arbutin, Kojic Acid and other lightening ingredients to inhibit the activity of tyrosinase, the enzyme involved in melanin production.

Melanin is the pigment responsible for the skin's darker color. Regularly used the YW day cream and the YW night cream can help to slow down melanin production and prevent skin darkening, while gradually reducing visibility of melanic spots.