Collagen Exfoliant Set Strong with Collagen Day Serum, Collagen Night Serum & 10% AHA Active Fluid Our Collagen Exfoliant Set Strong is a unique three-part skin care system, specially designed to reduce the signs of aging and loss of skin elasticity. The Collagen Exfoliant Set Strong, consisting of 10% AHA Active Fluid, Collagen Day and Collagen Night Serum is the elemental base of your daily skin care routine. The 3 products contained in synergy help to regenerate the skin, smooth wrinkles and fine lines and stimulate cell renewal. The skin looks younger, more vital and feels more supple.