No Frizz hair serum™ -Helps to seal in the moisture already in the hair. Great for improving shine and helps to strengthen the hair shaft. Ingredients: Castor oil. Rosemary oil. Lavender essential oil and cedarwood oil. Application: Apply a few drops of serum to your hands to give them a nice sheen and then scrunch the serum into the hair. Take a little more and smooth out the frizzy parts of your hair.