Biolage Full Rescue Invigorating Serum – 1.6oz is a potent, leave-in treatment designed to revive and fortify damaged, fragile hair. This concentrated formula features a blend of strengthening ingredients, including vegan squalane and ceramides, to help repair the hair fiber, reduce breakage, and restore vitality from root to tip. Lightweight yet powerful, it absorbs quickly without residue, leaving hair feeling stronger, smoother, and visibly healthier with every use. Perfect for targeted repair and daily defense.