Olaplex No. 9 Bond Protector Frizz Reduction & Heat Protectant Hair Serum 3 oz
by Olaplex · hair_care
Editor's Take
Patented bond repair and marine anti-pollution tech in a silicone-free base, but the fragrance allergen load and synthetic polymer system push it far from clean.
Four-pillar formula scores
- Efficacy: 8.8 / 10
- Modern Tech: 8.5 / 10
- Clean Beauty: 3.8 / 10
- Sustainability: 7.3 / 10
The Verdict
This is a structurally sophisticated treatment serum that delivers on its core promise: bond repair via Bis-Aminopropyl Diglycol Dimaleate, thermal protection to 450°F, and a marine extract shield against pollution. The water-based delivery system avoids silicones and relies instead on quaternary ammonium compounds and synthetic polymers for slip and hold, which gives the formula its performance edge but tanks the clean score. Worth it if you prioritize structural repair and heat protection over ingredient minimalism; the fragrance allergen load makes it a skip for sensitive scalps.
Full INCI list
Water (Aqua/Eau), Propanediol, Betaine, Quaternium-22, Sodium Hyaluronate, Bis-Aminopropyl Diglycol Dimaleate, 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, Sorbic Acid, Phenoxyethanol, Ethylhexylglycerin, Sodium Benzoate, Fragrance (Parfum), Citral, Citronellol, Hexyl Cinnamal, Limonene, Linalool