I'm in the UK. When he ran out of shampoo one day, my husband had no choice but to use my shampoo. That was about 10 years ago and it is the only one he now uses. In the past, his wavy European, slightly coarse hair used to get greasy and the products he used gave him pretty bad dandruff. Since using this product, those problems have disappeared. His hair is soft and smooth, never greasy, and dandruff is a thing of the past. He only needs to wash his hair a couple of times a week and uses the shampoo alone (he thinks the conditioner is too heavy for him). Brilliant product!