7 Signs Your Expensive Hair Serum Is Actually Harming You

3. Unwanted Greasiness

While serums are designed to add shine and manageability, they can sometimes leave your hair feeling greasy and weighed down. This is often due to the overuse of heavy silicones, which can build up on the hair shaft and attract dirt and pollutants. If you find yourself needing to wash your hair more frequently or if it feels limp and lifeless shortly after application, it might be due to excessive product buildup. Switching to a lightweight serum or one specifically formulated for your hair type can help restore balance and prevent that greasy aftermath.