Several outlets have reported on the best shampoos, with some focusing on sulfate-free options and others on shampoo bars or products for specific hair types or concerns. The number of shampoos tested and recommended varies across the reports, with some highlighting a selection of around 7 products and others evaluating larger numbers. The shampoos are being promoted for their ability to provide a gentle clean, promote hair growth, and address specific issues such as psoriasis or itchy scalps.