Shampoo can be traced back to ancient times. One of the earliest references to shampoo-like products comes from India in the 7th century.
This early shampoo was made from various herbs and other natural ingredients. It was commonly used as a head massage oil and was said to promote hair growth.
These early shampoos were also used in Europe during the Middle Ages. However, they were not used to clean the hair but rather to treat scalp conditions. Early shampoos were often very harsh and could even damage the hair.