Product Details This weightless Olaplex No.0.5 Scalp Longevity Treatment immediately hydrates and soothes the scalp as it protects against accelerated scalp aging to promote hair health over time. For all hair and scalp types. Trichologist approved and dermatologist tested. Proprietary Scalp Barrier-Building Complex Patented OLAPLEX Bond Building Technologyre-links disulfide bonds within keratin to strengthen the Stratum Corneumthe scalp barrier. Plus, a blend of essential fatty acids and ceramides provides nourishing lipid replenishment to hydrate a dry scalp.; Antioxidant-Rich Blend Of Lavender Extract and Tazman Pepper extract Helps protect against damaging free radicals and accelerated scalp aging caused by stressors like sun, poor water quality, irritants, chemical treatments, hair products, stress, lack of sleep, and an imbalanced diet. Biome Pro-Balancing Blend Balances the microbiome and reinforces the scalp barrier to maintain a healthy scalp environment, which helps protec