The Olaplex No.4 Bond Maintenance Shampoo is a professional-grade shampoo formulated with biotin as its active ingredient. It is designed for all hair types and is cruelty-free, making it suitable for a wide range of users. This shampoo is part of the Olaplex product line and has a period after opening of 12 months, ensuring it remains fresh and effective for an extended period of time. Ideal for those looking to maintain the health and strength of their hair, this shampoo provides gentle cleansing and nourishment.