Most leave-in serums simply coat the surface, giving temporary slip but little long-term support. OLAPLEX No.9 Bond Protect Nourishing Hair Serum goes deeper, pairing pollution and heat protection with patented bond-building technology to help hair feel smoother, softer and more resilient day after day.

At the core is OLAPLEX’s Bis-Aminopropyl Diglycol Dimaleate, a bond-building molecule that helps support the hair’s internal structure, particularly on damaged or over-processed lengths. Sodium hyaluronate and betaine draw in and hold moisture, while panthenol helps hair feel softer and more flexible. Red algae and brown seaweed extracts provide anti-oxidant support against environmental stressors.

The formula is a lightweight, water-based serum that spreads easily through damp hair without stickiness or greasiness. Once dry, hair feels soft and satin-like with a natural-looking finish, not heavy or waxy. It is designed to be layered with other styling products without causing build-up or residue.

Apply to clean, towel-dried hair as your first leave-in step before styling. Focus on mid-lengths and ends, then comb through for even distribution. Use before blow-drying, air-drying, or heat styling to help protect against damage while enhancing smoothness and shine.

Silicone-free formula delivers slip and shine without weighing hair down.Patented OLAPLEX Bond Building Technology targets damaged bonds to support stronger-feeling hair.Anti-oxidant rich marine extracts help protect against pollution-related dullness and dryness.Provides heat protection up to 232°C to support hair during styling tools use.

For deeper repair, use after OLAPLEX No.3 Hair Perfector and your preferred OLAPLEX shampoo and conditioner, then follow with No.6 or No.7 for additional smoothing or shine. It slots easily into an existing OLAPLEX routine as the protective prep step before styling.

A sophisticated, weightless serum that defends against daily damage while supporting smoother, softer, stronger-feeling hair with every use.

Water/Aqua/Eau, Propanediol, Betaine, Quaternium-22, Bis-Aminopropyl Diglycol Dimaleate, Sodium Hyaluronate, Cetrimonium Chloride, Panthenol, Hydroxyethylcellulose, PVP, Guar Hydroxypropyltrimonium Chloride, Furcellaria Lumbricalis Extract, Pelvetia Canaliculata Extract, Xylitylglucoside, Polyquaternium-44, Anhydroxylitol, Maltitol, Citric Acid, Trisodium Ethylenediamine Disuccinate, Xylitol, Ethylhexylglycerin, Sodium Hydroxide, Sorbic Acid, Phenoxyethanol, Sodium Benzoate, Fragrance (Parfum), Citral, Citronellol, Hexyl Cinnamal, Limonene, Linalool

• Step 1. Start with freshly washed, towel-dried hair, ensuring excess water is gently squeezed out.
• Step 2. Dispense a small amount of serum into your hands; start with a pea to dime-sized amount depending on hair length.
• Step 3. Rub hands together and apply evenly through mid-lengths and ends, avoiding the roots if prone to oiliness.
• Step 4. Comb or brush through to distribute the serum uniformly and detangle.
• Step 5. Style as desired, either air-drying or blow-drying; use before any heat tools for protection.
• Step 6. On dry hair, apply a minimal extra amount to very dry or frizzy areas if needed, avoiding over-application.

Pro Tips

• Layer No.9 as your first leave-in after washing, then follow with creams or oils to customise hold and shine.
• Focus on the most sensitised areas, usually the last few inches of hair, for targeted softness and protection.
• Use a wide-tooth comb to distribute the serum evenly and minimise mechanical breakage on wet hair.
• For fine hair, start with less product and build gradually to avoid overloading; concentrate below ear level.