They are cheating on the amount of shampoo in the bottle
This is a great shampoo and helped me stop my hair loss. However, what they sell in the US is really thin, diluted liquid, compared to the same shampoo they sell in the UK, which is nice and thick. Although they sell the same bottle, my US versions run out more than twice as fast as their UK counterparts. The prices of the US versions are higher too.
Rating: 2 stars