Olaplex Nº.0.5 Scalp Longevity Treatment Serum, 50 mL — Lightweight Bond-Building Hydration & Soothing

The scalp ages faster than other skin, which can influence hair appearance and resilience. Olaplex Nº. 0.5 combines the brand’s patented bond-building technology with a scalp-focused barrier complex, antioxidant extracts, and microbiome-balancing ingredients to give immediate hydration and ongoing support. This trichologist-approved, dermatologist-tested formula is weightless, suitable for all hair textures, and designed to be layered into your regular routine to protect and strengthen the scalp environment.

How does Nº. 0.5 hydrate and calm the scalp right away?

The serum uses humectant and barrier-supporting actives to provide rapid moisture and a soothing feel without heaviness. Users report an immediate increase in scalp hydration and reduced tightness after application.

• Delivers 5X more scalp hydration on contact (clinical results).
• Lightweight texture absorbs quickly without residue or greasiness.
• Calming botanical extracts reduce sensations of dryness and discomfort.

What ingredients help protect the scalp long term?

Nº. 0.5 blends Olaplex’s patented bond-building technology with a scalp barrier-building complex and antioxidant extracts to reinforce the scalp’s outer layer. Over weeks, this combination helps improve barrier integrity and supports a balanced scalp microbiome.

• Patented bond builders that support keratin linkages in the stratum corneum.
• Biome pro-balancing blend to maintain a healthier scalp environment.
• Lavender and Tazman pepper extracts provide antioxidant protection.

Will this serum suit my hair type—coily, curly, straight, or wavy?

Nº. 0.5 was formulated for all hair and scalp types, from fine and straight to dense coils. Its weightless nature means it won’t weigh down fine hair, while its barrier benefits support scalp health under any styling or care regimen.

• Non-greasy formula that layers under styling products and oils.
• Safe for color-treated, chemically processed, and natural hair textures.
• Designed to be gentle enough for daily or targeted use as needed.

How quickly will I see results and what do clinical tests report?

Clinical testing shows visible improvements over time and measurable hydration immediately. While individual outcomes vary, many users notice softer-feeling hair and a calmer scalp after consistent use.

• Immediate: 5X more hydrated scalp upon application (clinical measurement).
• Short term: 51% improvement in scalp barrier function in 14 days (clinical data).
• Visible hair improvements reported after about 4 weeks of continuous use.

Who is this for: Olaplex Nº. 0.5 is intended for anyone who wants to prioritize scalp health—people experiencing dryness, sensitivity, early signs of scalp aging, or those simply aiming to maintain a stronger scalp environment for better-looking hair. It suits every hair texture and integrates easily into existing routines, whether you’re looking for immediate soothing or a long-term protective step in your haircare lineup.

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