The Olaplex number 4 shampoo is a new product from the brand Olaplex. It is designed to be a high-quality shampoo that helps to nourish and strengthen the hair. Specifically formulated to repair and protect damaged hair, this shampoo is part of a professional haircare system that is known for its effective results. With Olaplex's reputation for delivering salon-quality products, the Olaplex number 4 shampoo is a great choice for those looking to improve the health and appearance of their hair.