PROYOU the fixer booster 10x15 ml PROYOU the fixer booster 10x15 ml is a product designed to help protect, strengthen, and condition hair. It contains a unique blend of natural ingredients, including plant-based proteins, vitamins, minerals, and essential oils, to help nourish and protect the hair from damage. It also contains a UV filter to protect against sun damage. The booster can be used on both wet and dry hair and is suitable for all hair types. It is designed to be applied before styling to help provide extra hold and shine, and after styling to help maintain the look.