A highly concentrated leave in smoothing cream that strengthens, moisturises and speeds up blow dry times. N?6 is excellent for all hair types, including coloured and chemically treated hair, and eliminates frizz and flyaways for up to 72 hours. Key benefits doesn't weigh hair down speeds up blow dry times can be used to blow dry or air dry ph balance 4.0 5.0 pro tip for maximum results, concentrate the product from mid length to ends, comb through and style as desired. To use apply a very small amount to damp or dry hair, concentrating the product on your mid length to ends. Comb through and style as desired. Where apply product from mid lengths to the ends. Start with 1 2 pump for shoulder length hair. Use more for longer, thicker hair. Less for fine or short hair. When apply to wet hair and air dry for lived in texture. Apply sparingly to dry hair to tame frizz and flyaways. For all hair types. Blow dry or air dry styling. Olaplex products are thoroughly tested in house and by independent third party laboratories for safety and efficacy. This product testing includes the industry standard human repeat insult patch test hript, which tests for skin irritation or sensitivity. All olaplex products have passed the hript, meaning the products show no signs of causing irritation, inflammation, or sensitivity.