Product Description
Olaplex No. 9 Bond Protector Nourishing Hair Serum is an ultra-lightweight, heat-protective hair styling serum that creates a satin shine and lasting style retention while reducing tangles and static. Plus, it provides immediate pollution protection. Pollutants can bind to hair and cause free radical damage that affects the appearance of hair health.Benefits :
-Improves style retention and reduces tangles and static
-Protects color and provides satin shine
-450ºF/232ºC heat protection
I have previously emptied Olaplex Intensive Bond Building Hair Treatment No. 0 and Olaplex No.7 Bonding Oil which served different needs to Olaplex No. 9 Bond Protector Nourishing Hair Serum which I purchased during a sale.
When it comes to hair care, most of us focus on shampoos and conditioners but the real game-changer often comes after you step out of the shower. That’s where leave-in serums come in. Lightweight yet powerful, these multitasking formulas are designed to stay on your hair, providing continuous nourishment, protection, and shine throughout the day.
Unlike rinse-off treatments, a leave-in serum works behind the scenes to smooth frizz, detangle knots, seal split ends, and shield hair from heat and humidity all without weighing it down.
Packaging, Scent and Texture
Olaplex No. 9 Bond Protector Nourishing Hair Serum comes in a 90ml bottle with a convenient spritz dispenser that makes application easy and mess-free. Its lightweight, non-greasy formula spreads effortlessly through the hair, leaving it soft, smooth, and manageable without any heaviness.
The serum carries a pleasant, salon-like fragrance that adds a touch of luxury to your routine, though the scent fades quickly after application, perfect for those who prefer subtle, non-overpowering hair products.
How To Use :
1) Apply a small amount to clean, damp hair working upward from ends to roots. Use more as needed for longer, thicker hair.
2) Style as usual. Air-dry for a soft texture. Blow-dry for a smooth finish. Diffuse for defined waves or curls.
Performance and Ingredients
Olaplex No.9 Bond Protector Nourishing Hair Serum is a lightweight, anti-damage leave-in treatment designed to protect, repair, and nourish hair after washing. This out-of-shower styling serum helps defend your strands from environmental pollutants for up to 48 hours, keeping hair healthier and more resilient.
Formulated with Olaplex’s patented bond-building technology, it features their signature ingredient, Bis-Aminopropyl Diglycol Dimaleate, the same powerful bond-repairing component found in the cult-favorite Olaplex No.3 Hair Perfector. This hero ingredient works deep within the hair structure to repair broken bonds, strengthen damaged strands, and improve overall hair texture.
Free from silicones, color-safe, and vegan, the serum’s clear gel texture feels weightless on the hair. It performs beautifully on both dry and towel-dried hair. When used on dry hair (perfect for busy mornings), it instantly softens and smoothens strands while taming frizz and flyaways. Applied on towel-dried hair before blow-drying, it adds a healthy shine and makes detangling easier, leaving hair silky, manageable, and polished.
The key ingredients are...
PVP : A flexible polymer that helps maintain hair style and shape.
Cetrimonium Chloride : Conditions, smoothes, softens, and has an anti-static effect.
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
Conclusion
To conclude, the Olaplex No.9 Bond Protector Nourishing Hair Serum lives up to the brand’s reputation for delivering salon-quality results at home. Its lightweight, non-greasy formula makes it suitable for all hair types, especially those looking to restore smoothness, shine, and strength without buildup. Whether used on dry hair to control frizz or on damp hair to protect from heat styling, it consistently leaves hair feeling softer, healthier, and more manageable.
If you’re already a fan of Olaplex’s bond-repairing range, this leave-in serum is a worthy addition to your routine offering both protection and repair in one easy step. For anyone seeking a lightweight leave-in treatment that strengthens while enhancing shine, Olaplex No.9 is a reliable pick that delivers visible results with every use.

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