I had thick hair until I started treating my hair with colors and straighteners, and what not! I am 21 and for last 3 months, I have quit using straighteners, and have minimized the use of hair dryer as well. I am using Garnier fructis shampoo and leave-in conditioner for my hair, to keep it healthy. Nonetheless, I saw Folliderm hair serum at the local chemistâs shop yesterday, and the assistant there told me that it worked amazing on thinning hair! He advised me to buy the shampoo along with serum to get the results soon. However, before I switch to any other shampoo, I want to know from some hair expert, whether it anyways enhance the efficaciousness of using serum and shampoo of the same brand! Would you recommend it to me? Please advice.