Butterfly Pea Flower Facial Toner natural promotes COLLAGEN!!! Because butterfly pea flower contains plant-based antioxidants and antioxidant vitamins such as Vitamins A, C and E, it helps improve the skin's natural barrier. This is the top layer of your skin called the stratum corneum, and its purpose is to protect your body from irritants, including allergens and bacteria, proanthocyanidin, which stimulates the natural production of collagen and elastin. 8 oz. bottle.