GK Taming Resistant Formula 3.4oz The GK Resistant formula is a top-quality hair straightening treatment that can turn curly or wavy hair into smooth, shiny locks. This treatment contains Juvexin, which is a Keratin protein known for its anti-aging properties, as well as anti-static agents and coconut oil. These ingredients work together to keep hair moisturized by slowing down the loss of moisture and keeping strands smooth and nourished. If you're looking for the best keratin hair straightening treatment for sleek, straight, and shiny hair, GKhair Resistant is the one for you.