L’Oreal Paris’s Professionnel Serie Expert – Serioxyl Advanced Densifying Professional Shampoo cleanses and purifies the scalp by lifting pollutants and excess sebum, while a magnesium-enriched blend (magnesium and magnesium sulfate) helps create a healthier base for hair growth. Designed for fine, fragile, or thinning hair, daily use delivers instant body with clinically observed 22% instant volume and up to 24-hour root lift for hair that looks denser and more radiant.Silicone- and alcohol-free with a hypoallergenic, gel-like texture, it boosts resilience, thickens the look of fine strands, and makes hair feel easier to style without weigh-down. It can be used by both men and women, and pairs well with the Density Activator Serum in the Serioxyl range for enhanced densifying results.