Olaplex Nº. 0.5 Bond Building Scalp Longevity Treatment — 50 mL lightweight hydrating, soothing serum

Olaplex Nº. 0.5 is a weightless scalp serum designed to hydrate, soothe, and support scalp barrier health to help hair look softer and more resilient over time.

The scalp ages faster than other skin and plays a key role in how hair looks and feels. Olaplex Nº. 0.5 Bond Building Scalp Longevity Treatment is formulated to provide immediate hydration and calming relief while reinforcing the scalp environment. It combines Olaplex’s patented bond-building technology with ingredients aimed at protecting the scalp barrier and balancing the microbiome so the scalp is better prepared to support healthy-looking hair.

How quickly will I notice hydration and soothing on my scalp?

The serum delivers immediate lightweight hydration and a calming sensation on contact, making it suitable for daily use or whenever your scalp feels irritated. Visible textural improvements to hair and scalp can develop with consistent use over weeks.

• Light, non-greasy texture absorbs quickly.
• Formulated for instant hydration and a cooling/plain soothing effect.
• Safe for all hair and scalp types, including coily, curly, straight, and wavy.

What technology and active blends are in this formula?

Nº. 0.5 pairs Olaplex’s patented bond-building chemistry with a specialized scalp-support complex. Ingredients were selected to strengthen the scalp’s outer layer while contributing antioxidants and microbiome-balancing elements.

• Patented OLAPLEX Bond Building Technology targets disulfide bonds to strengthen keratin in the scalp barrier.
• Scalp Barrier-Building Complex designed to reinforce the stratum corneum of the scalp.
• Antioxidant-rich extracts like lavender and tasmannia help protect against environmental stressors.
• Biome pro-balancing blend intended to support a healthy scalp microbial environment.

How should I use Nº. 0.5 in my routine?

Apply the serum directly to the scalp on dry or damp hair where you want targeted hydration or soothing. Use as a stand-alone treatment or incorporate it before other leave-in or styling products for an added protective step.

• Apply a few drops to sections of the scalp; gently massage until absorbed.
• Use daily or as needed to maintain hydration and comfort.
• Compatible with styling and other Olaplex treatments; non-oily finish prevents weigh-down.

Are there proven results or testing behind this product?

Clinical testing and consumer studies reported improvements when the product was used consistently, including increased scalp hydration and improved visible hair softness. Results vary by individual and depend on frequency of use and hair/scalp condition.

• Reportedly increases scalp hydration immediately after application in testing.
• Shows improvements in scalp barrier condition and visible hair softness with continued use.
• Formulated and tested to be safe for diverse hair types and scalp sensitivities.

Who is this for: Olaplex Nº. 0.5 is built for anyone concerned with dry, irritated, or aging scalp conditions who wants a lightweight, non-greasy serum that supports scalp barrier health. It suits all hair textures—coily, curly, wavy, and straight—and can be added to daily grooming routines or used when targeted scalp care is needed. Trichologist-approved and dermatologist-tested, this treatment is intended as a cosmetic support for scalp comfort and hair appearance rather than a medical therapy.

Ingredients

Aqua/Water/Eau, Glycerin, Propanediol, C9-12 Alkane, Octyldodecanol, Bis-Aminopropyl Diglycol Dimaleate, Phenoxyethanol, Sodium Acrylates Copolymer, Oryza Sativa (Rice) Bran Oil, Arginine, Chlorphenesin, Glycine Soja (Soybean) Seed Extract, Hydrogenated Polydecene, Lecithin, Coco-Caprylate/Caprate, Citric Acid, Menthoxypropanediol, 1,2-Hexanediol, Ceramide NP, Cetearyl Alcohol, Glyceryl Stearate, Tasmannia Lanceolata Leaf Extract, Phenethyl Alcohol, Pogostemon Cablin Leaf/Stem Extract, Lavandula Angustifolia (Lavender) Flower/Leaf/Stem Extract, Lavandula Oil/Extract, Pentylene Glycol, Leptospermum Scoparium Branch/Leaf Oil, Ceramide AP, Cholesterol, Hydrogenated Lecithin, Phytosphingosine, Stearic Acid, Magnolia Officinalis Bark Extract, Piper Nigrum (Pepper) Seed Extract, Tetraacetylphytosphingosine, Sodium Acetylated Hyaluronate, Sodium Hyaluronate, Sodium Hyaluronate Crosspolymer, Xanthan Gum, Hydrolyzed Sodium Hyaluronate, Ceramide EOP, Sodium Benzoate, Ethylhexylglycerin, Glycosphingolipids