4MSK has a structure similar to salicylic acid and is a new type of medicinal whitening ingredient used in cosmetics to achieve whitening effects. 

It is an effective ingredient in cosmetics. 4MSK can coordinate keratin metabolism, correct abnormal epidermal hyperplasia, promote the excretion of melanin, and achieve smooth and whitening skin; 

It can also block the source of melanin production in melanocytes and enhance self-healing ability. 

When used in combination with various types of whitening products, it can improve the whitening effect and has good development prospects.