Warm the serum between your hands for 5 seconds. Apply to your hair, working from the ends up to the middle of your strands. Try to spread the product evenly with your hands. Avoid applying the serum to your roots or using too much product, as this can make your hair look greasy Benefits Hair serum makes your hair shinier and healthier and reduces tangles. As the serum reflects light, it makes hair look lustrous and healthy. It also protects your hair from dust and humidity. Its low pH level prevents swelling and holds the hair fibers together, thus preventing damage