L'Oréal Professionnel Serioxyl Advanced Holiday Duo pairs a purifying shampoo with a targeted leave-in scalp serum for thinning hair and loss of density. Together, they create a two-step cleanse-and-treat routine for hair that looks fuller and more voluminous.

What's included

• 1 × Serioxyl Advanced Denser Hair Density Activator Serum, 90 ml: a daily leave-in scalp serum concentrated with 5% Stemoxydine and enriched with resveratrol to support denser-looking hair, with results reported from six weeks.
• 1 × Serioxyl Advanced Purifier Bodifier Shampoo, 500 ml: a clarifying shampoo formulated with magnesium that gently purifies the roots of buildup and leaves hair feeling densified, voluminous, and radiant.

Apply the shampoo to wet scalp and hair, lather gently, and rinse thoroughly. Follow with the serum on towel-dried hair, applying evenly to the scalp, massaging with fingertips, and leaving it in.