White Willow (Salix Alba) – A rare natural source of salicylic acid, which is a Beta Hydroxyl Acid. This botanical extract is effective at breaking down your outermost layer of skin to reveal the fresh, glowing skin beneath. Willow bark extract is often used to treat acne because of its anti-microbial properties and its ability to clear pores and renew skin. White willow is a tree found commonly in wetlands and along waterways.