Xhc Biotin And Collagen Thickening Shampoo 400mlXhc Biotin and Collagen Thickening Shampoo 400ml is a hair care product formulated with a combination of biotin and collagen, two essential nutrients known for their potential to promote hair thickness and strength. Biotin, also referred to as vitamin B7, plays a crucial role in the maintenance of healthy hair by supporting the production of keratin, the protein that forms the structure of each strand. Collagen, on the other hand, is a key component