Several outlets have reported on the best shampoos for various hair types and concerns, including frizzy, curly, and thinning hair. The recommended shampoos vary, with some lists including 13, 15, or 7 products, and are said to help with issues such as frizz, bounce, shine, and hair growth. The top shampoos are reportedly chosen based on testing and expert opinions from hair stylists, vogue editors, dermatologists, and other hair experts.