According to Kezhuang's inquiry. Com, Youselin is a century-old scientific research skin care brand in Germany, which belongs to Beiersdorf Group. With innovative research and development technology and rigorous experimental spirit, we provide efficient skin care products for consumers around the world. The products of Youselin have passed the strict safety test in European laboratories, and are free of alcohol, pigment, essence, paraben, paraffin wax, emulsifier and other components that may cause sensitivity or irritation, and are suitable for all skin types. Both the spot-fading essence and the light-sensing essence of Youselin contain patented peptide Amydol, which is a resorcinol derivative, which can prevent the production of melanin from the root and solve the pigmentation problem gently and efficiently. The whitening effect of peptide amiloride has been confirmed in clinical trials, but the safety of long-term use needs more data support. Other ingredients, such as ethanol, oxalis, etc. , still added to Yosemite's products, may destroy the skin barrier, causing dry or sensitive skin. Therefore, people with sensitive skin should be cautious when using Yosemite products. It is best to have a skin test first to see if there are any adverse reactions.