Renpure Biotin & Collagen Thickening Leave-In Treatment is infused with nutrients to help fine hair look and feel thicker and fuller. Our Biotin & Collagen Thickening Leave-In Treatment contains a blend of Vitamin B7 (Biotin) and protein (Collagen), created to give you the appearance of full, healthy-looking hair. At Renpure, we believe that everyone deserves beautiful hair, without compromise. Our naturally derived hair care products bring your hair to life without the use of harmful ingredients, while caring for our planet. For best results, use after washing your hair with Renpure Biotin & Collagen Shampoo and Conditioner. Spray evenly on damp hair. Gently comb product through hair to evenly distribute. Style as usual. Like you, Renpure is beautiful inside and out. Our bottle and sprayer are both made from post consumer recycled plastic, making sustainable choices easier. After rinsing, remove sprayer and drop the bottle into the recycling bin.