The best thing you can do is make sure that you are hydrating your hair. I use John Freida's Smooth Start shampoo and Phyto's Phytojoba conditioner, and my hair no longer frizzes. Be sure to use good serums, like Phytodefrisant, or a silicone-based serum (I like Paul Mitchell's Super Skinny Serum). If you need more help, try a good hair mask like Ojon's Restorative Hair Mask or Phytonectar. And if you are flat ironing, a good heat protectant is a must. Redken's Iron Silk is by far the best. Also, dry shampoo you hair so that you can go longer between shampoos - shampooing too often is not good.