Cucumber peel extract contains moisture-binding, soothing, tightening, anti-itching, refreshing, healing, and anti-inflammatory properties. This is one of the reasons why cucumbers are often placed on the eyes at spas. While cucumber is majority water, about 95%, the peel is where most of the nutrients and vitamins are found. It contains vitamin K, antioxidants, and potassium which help to reduce the appearance of fine lines and wrinkles.