Damaged and stressed hair is usually also dry and brittle, but there is a significant difference between these two types of hair frustrations. Dry hair is caused by the lack of oil supply to the root. During the autumn and winter months, heated indoor air and frequently wearing head coverings can have a negative effect on dry hair. On the other hand, stressed hair is due to external influences. Treatments such as dyeing, tinting or styling the hair with heat will damage the hair's protective layer. Vivasan products provide stressed hair with the nutrients it needs.