A weightless, antioxidant -rich, multi-benefit serum that provides pollution protection to perfect and protect all hair types and textures. Frizz Control, Anti-Static, Detangling, Bounce-Back memory. **OLAPLEX products are thoroughly tested in-house and by independent third-party laboratories for safety and efficacy. This product testing includes the industry standard Human Repeat Insult Patch Test (HRIPT), which tests for skin irritation or sensitivity. All of OLAPLEX products passed the HRIPT, meaning the products show no signs of causing irritation, inflammation, or sensitivity. **