Olaplex No. O.5 Scalp Treatment for all hair types

Olaplex

No. 0.5

Scalp Longevity Treatment 1.7 oz
For All Scalp & Hair Types
$ 44.00
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Pickup available at Paul Labrecque Salon & Skincare Spa New York Usually ready in 4 hours

No. 0.5

Paul Labrecque Salon & Skincare Spa New York

Pickup available, usually ready in 4 hours

5 East 57th Street
Floor 9
New York NY 10022
United States

+12129887816

Paul Labrecque Salon & Skincare Spa Palm Beach

Pickup available, usually ready in 4 hours

The Royal Poinciana Plaza, 50 Cocoanut Row
The Slat House, Suite 120
Palm Beach FL 33480
United States

+15614028207

Your scalp ages six times faster than your face. It's time to treat it that way.

Meet the Nº.0.5 Scalp Longevity Treatment. OLAPLEX's first-ever bond-building scalp serum, clinically proven to fight accelerated scalp aging and create the foundation your hair needs to thrive. This weightless, leave-in serum works on a molecular level, immediately hydrating and soothing the scalp while delivering long-term anti-aging protection against the daily stressors that break down scalp health over time: UV exposure, hard water, chemical treatments, heat styling, stress, and environmental pollution.

The skin on the scalp has a naturally lower barrier function and slower cell turnover than the skin on the face and body, making it more susceptible to accelerated aging. The Nº.0.5 targets this directly with a three-pronged complex: patented OLAPLEX Bond Building Technology, an antioxidant-rich botanical blend, and a microbiome-balancing formula. The ultra-lightweight texture absorbs instantly with zero residue, making it compatible with all hair types, textures, and styling routines.

Trichologist approved, dermatologist tested, and free of parabens, phthalates, and sulfates. Vegan and cruelty-free.

Instantly hydrates & soothes a dry, irritated scalp
Delivers immediate comfort from the first application, calming dryness, tightness, and sensitivity.

Fights accelerated scalp aging
Protects against the six major aging stressors (UV, hard water, pollution, chemical treatments, stress, and poor diet) that break down the scalp barrier over time.

Strengthens the scalp barrier
Patented bond-building technology works at a structural level to reinforce the Stratum Corneum, the skin's first line of defense.

Balances the scalp microbiome
The Biome Pro-Balancing Blend reinforces the scalp barrier and maintains a healthy scalp environment, which helps protect long-term hair health.

Promotes visibly softer, shinier, healthier hair
Because healthier hair starts at the root.

Weightless, residue-free formula
Absorbs instantly and layers seamlessly under styling products, heat protectants, or serums without buildup.

Works on all hair types and textures
Straight, wavy, curly, coily, color-treated, chemically processed, or natural.

Step 1 Part & Section
Using the precision needle-nose applicator, part your hair and apply directly to the scalp. Work in 3–4 sections across the crown and back of the head.

Step 2 Apply
Gently squeeze the tube as you move along each section, depositing the serum directly onto the scalp. Take your time, even coverage is key.

Step 3 Massage
Use your fingertips to massage the serum thoroughly into the scalp to ensure full absorption and even distribution.

Step 4 Style or Sleep
No rinsing required. Use on wet hair before styling, or apply to dry hair as an overnight treatment before bed for deeper results.

Frequency: For best results, use 3× per week. Gentle enough for daily use.

Q: What makes the Nº.0.5 different from other scalp serums on the market?

A: Most scalp serums focus only on surface-level hydration. The Nº.0.5 works at a structural level using OLAPLEX's patented bond-building technology to actually strengthen the scalp's Stratum Corneum, while simultaneously balancing the microbiome and delivering a clinically proven antioxidant defense. It's the first scalp treatment to apply bond-building science to scalp skin, not just hair.

Q: Can I use the Nº.0.5 if I have color-treated or chemically processed hair?

A: Absolutely. The Nº.0.5 is designed for all hair and scalp types, including color-treated, bleached, relaxed, and keratin-treated hair. In fact, chemical services are one of the top stressors that accelerate scalp aging, making this treatment especially beneficial for those who regularly color or chemically process their hair.

Q: Will this make my hair feel greasy or weigh it down?

A: No. The Nº.0.5's lightweight formula absorbs quickly with no residue left behind, making it the perfect first step before applying styling and heat protection products. It's been specifically formulated to leave zero greasy or heavy feeling on the hair shaft.

Q: How soon will I see results?

A: You'll feel the difference immediately> Your scalp feels soothed and more comfortable from the very first application. Clinically, a 5× improvement in scalp hydration is measurable right away. A 51% improvement in scalp barrier strength is seen within 14 days, and visibly healthier, softer hair is typically noticeable after 4 weeks of consistent use.

Q: Can I use the Nº.0.5 alongside other OLAPLEX products?

A: Yes and it's highly recommended. The Nº.0.5 is designed to be the first step in your OLAPLEX routine, applied directly to the scalp before you reach for your Nº.4 shampoo or any other treatment. It pairs seamlessly with the full OLAPLEX system to address hair health from root to tip.