Hello, very interesting article. I can also recommend a serum from Vitamins. You can buy it here https://www.amazon.com/Keratin-Infused-Protein-Hair-Serum/dp/B01456DJ66 . Their products are very cool and help me a lot to take care of my hair. I started using it about six months ago and my hair has completely changed and become much better, although before they were in a terrible state.