L'Oreal Serie Expert Keratin Alpha Sleek Mirror Sleek Serum

Keratin Alpha Sleek Mirror Sleek Serum is a heat-activated leave-in serum designed to seal the hair’s structure for long-lasting smoothness, frizz control, and humidity protection for up to 10 washes. Formulated with 5% Keratin Sealer technology, this advanced serum works by coating and sealing the outer keratin layer of the hair to help control frizz, reduce excess volume, and create a sleek, polished finish. It also provides anti-humidity protection in up to 80% humidity and offers heat protection up to 230°C (450°F), helping to shield hair during styling. The result is hair that appears smoother, softer, and more manageable with a lasting mirror-like shine.