"Non-sensitizing plant extract (also known by its Latin name of Cucumis sativus). Most types of cucumber are composed of 95% water, and the other constituents primarily include ascorbic acid (vitamin C), caffeic acid (an antioxidant), fatty acids, the mineral silica, plus other trace minerals. Due to its antioxidant activity, cucumber is a welcome addition to anti-aging products.
Cucumber contains fragrant components that are not sensitizing to skin (a rarity) so it can be used to enhance the natural scent of a cosmetic product without issue." - https://www.paulaschoice.com/ingredient-dictionary/antioxidants/cucumber-extract.html