Olaplex Scalp Longevity Treatment Serum 50 mL — Lightweight Hydrating, Bond-Building

Olaplex Nº. 0.5 is a lightweight scalp serum that hydrates and soothes the scalp while reinforcing its barrier to support healthier-looking hair over time.

This concentrated 50 mL treatment is formulated to target the scalp—the foundation of hair health—by delivering immediate moisture, calming sensations, and active ingredients designed to support barrier integrity and a balanced microbiome. Dermatologist-tested and trichologist-approved, the formula is suitable for coily, curly, wavy, and straight hair and aims to protect against factors that accelerate scalp aging without weighing hair down.

How quickly will I notice hydration and relief?

Users typically feel an immediate cooling and hydrating effect right after application. Over the first days and weeks, regular use helps maintain increased scalp moisture and reduces sensations of dryness or tightness.

• Immediate lightweight hydration upon application
• Clinically measured increased scalp hydration after first use
• Regular use supports a more resilient scalp environment

What active technologies and ingredients are in the formula?

The serum combines Olaplex’s patented bond-building technology with a Scalp Barrier-Building Complex that targets the scalp’s outer layer. It also includes antioxidant-rich botanical extracts and a biome-balancing blend to help protect and support a healthy scalp ecosystem.

• Patented OLAPLEX bond-building technology to support the scalp barrier
• Lavender and Tasman pepper extracts to provide antioxidant support
• Biome pro-balancing ingredients that help maintain microbial balance

How should I apply the Nº. 0.5 serum for best results?

Apply to a dry or damp scalp, sectioning hair for targeted delivery along the part and throughout the scalp where needed. Massage gently to distribute the serum evenly; no rinse required so it fits easily into morning or evening routines.

• Use daily or as recommended by a professional for ongoing care
• Apply a few drops per section and massage until absorbed
• Safe to pair with other Olaplex treatments and styling products

What outcomes can I expect from continued use?

With consistent application, the serum aims to support a more hydrated, comfortable scalp and hair that looks smoother and more manageable. Independent clinical measures show improvements in scalp hydration and barrier markers over weeks of use.

• Noticeably softer, shinier-looking hair after ongoing use
• Improved scalp moisture and barrier metrics within weeks
• Formulation designed for all hair textures and scalp types

Who is this for: Olaplex Nº. 0.5 is designed for anyone who wants to prioritize scalp health—those experiencing dryness, sensitivity, or looking to proactively protect against scalp aging. It’s suitable for all hair textures (coily, curly, wavy, straight) and for users who want a lightweight, non-greasy serum that fits into daily care rituals and pairs well with professional scalp and hair treatments.

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