Thickening Serum Thickening Serum Wearing thin? This nightly, leave-in treatment fattens and fortifies over time for thicker, stronger strands and fuller hair (really). Who: Those wearing thin, the fine, and the ultra-fine. Full: $27.00 Got Questions? Name * Email * Phone Number * Message * reCAPTCHA If you are human, leave this field blank. Δ Connect with a Le Palais Expert