A test of natural shampoos has been conducted, with various outlets reporting on the best shampoos for different hair types and needs. The number of top-rated shampoos varies, with some sources listing 7, 9, 11, 12, or 13 top shampoos, and some focusing on specific types such as curly hair, oily hair, or dandruff. The tests involved a range of participants and products, including shampoo bars, and evaluated factors like lather, shine, and cleanliness.