Sunsilk Anti-Flat Shampoo with Collagen-C - 12 Oz Sunsilk Anti Flat Shampoo with Collagen C keeps hair from blah to full of body and bounce. Description UNILEVER . will pick you up with Anti-Flat Shampoo. Formulated with Collagen-C, it will take your hair from blah to full of body and bounce. Flat Hair Need a Lift. Turns blah into body and bounce. Sunsilk Sunsilk Anti-Flat Shampoo Water (Aqua), Sodium Laureth Sulfate, Cocamidopropyl Betaine, Ammonium Chloride, Fragrance (Parfum), PPG-9, Polyquaternium-10,