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OLAPLEX N°.0.5 Scalp Longevity Serum Treatment
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Highlights
Summary
OLAPLEX N°.0.5 Scalp Longevity Serum Treatment is a weightless scalp serum that targets visible scalp aging, strengthens the scalp barrier, and immediately hydrates to support softer, healthy-looking hair.
Benefits
- Immediately hydrates and soothes scalp
- Strengthens and protects scalp barrier and microbiome
- Promotes soft, shiny and visibly healthy hair
- Hydrating and Anti-aging
Key Ingredients
- Proprietary Scalp Barrier-Building Complex Patented OLAPLEX Bond Building Technology™ re-links disulfide bonds within keratin to strengthen the Stratum Corneum–the scalp barrier. Plus, a blend of essential fatty acids and ceramides provides nourishing lipid replenishment to hydrate a dry scalp.
- Antioxidant-Rich Blend Of Lavender Extract & Tazman Pepper extract Helps protect against damaging free radicals and accelerated scalp aging caused by stressors like sun, poor water quality, irritants, chemical treatments, hair products, stress, lack of sleep, and an imbalanced diet.
- Biome Pro-Balancing Blend Balances the microbiome and reinforces the scalp barrier to maintain a healthy scalp environment, which helps protect hair health.
Research Results
- Visibly healthy, softer hair after 4 weeks*
- 5X more hydrated scalp immediately**
- 51% improved scalp barrier in 14 days**
- 80% said scalp felt nourished after just one use*
- *Based on a consumer perception study of 75 participants after 28 days of use.
- **Based on a 16-week dermatologist-supervised clinical test of 25 participants following usage described on label
Item 2641617
- Part hair with needlenose applicator. Squeeze gently and apply directly to scalp.
- Continue for as many sections as needed. OLAPLEX Pros suggest 3-4 sections on the crown and back of head.
- Massage thoroughly into scalp to ensure proper absorption. Use before styling wet hair or as an overnight treatment when hair is dry. For best results, use three times a week. Gentle enough for daily use.
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.
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Reviews
Review Snapshot
by PowerReviews
Ratings Distribution
Hair Type
Most Helpful Positive Review
89/100
Before I tried this product, I viewed Olaplex as a brand for people who were born with good hair and just went to the salon to drop a few c-notes to get a touch up. I'm not one of those people. With hair, I am very low maintenance, preferring to wet it and forget it (antithetical to Olaplex in my ...
Most Helpful Critical Review
Not for me
I really wanted this scalp treatment to be a win, especially since I usually love Olaplex' products. Their shampoo and conditioner have been staples in my routine for a while, so I had high expectations going into this. Unfortunately, it didn't quite deliver on what I needed it for. To start with th...
180 results
Scalp Wonder
I have used this OLAPLEX serum on my hair for the past 4 weeks. The packaging is nice & basic. I love the tip on the bottle, it makes frequent application easy and quick which motivated me to use it nightly. The serum itself is lightweight, hydrating so it keeps my scalp moisturized, and absorbs quickly. I do not wash my hair often and I did not notice any buildup. I have seborrheic dermatitis of the scalp and this helped with the dryness, flakes, and to calm the irritation. I did not notice a difference in overall softness or health of my physical hair strands (could be due to the fact my hair is color treated) but my scalp itself did benefit from this serum. I recently got an undercut and am using the serum in the area, so I will have a good test of how the serum influences natural virgin strands. I would recommend this serum to be used with a repair treatment that is specific to hair strands. This product was provided for promotional purposes in exchange for my honest review.
Really works
This product was provided for promotional purposes in exchange for my honest review. I've been using the Olaplex Scalp Longevity Treatment for almost a month now, and I'm genuinely impressed. The scent is subtle and fresh, and the texture is lightweight and pleasant to apply. My scalp, especially in the areas that were dry and had less hair, looks much healthier and more hydrated—even now while I'm on vacation in a hot, dry climate. I love that I can use it on both clean, wet hair and dry hair daily. There's no itching or tingling—honestly, no sensation at all—but the results are real. This treatment really works!


Helps alot with breakage!
I like the Olaplex No. 5. This is that weightless scalp serum that's supposed to help with visible scalp aging, strengthen your scalp barrier, and give immediate hydration for softer, healthier-looking hair. After using it for a bit, I've definitely noticed some pretty good results. The biggest thing for me is the breakage. I've seen way less breakage overall, which is a huge win. My hair also feels noticeably softer, which is always a nice bonus. What really stood out was when I was brushing my hair after a shower. Usually, that's when I see a fair amount of hair come out, but with this serum, it broke a lot less. This helps alot with the split ends I was struggling from, and is my main pro for this item. That alone makes a big difference in how my hair feels and looks day-to-day. It seems like it's really doing its job to support healthier hair from the root. Overall, I'm pretty happy with it. Product was received as part of an educational promotion.


possible hair savior
I never realized until using this product how essential the scalp truly is and the role is playing in my hair health and overall look. since now having used this a couple times a week for 2-3 weeks I can visibly see the difference. overall my hair from root to end looks healthy but the feel of it to is so different. its smoother and softer to the touch and SO much easier to manage. typically my hair would knot almost instantly after brushing it and my roots would get oily after one day post shower but slowly its changing (definitely the tangles & a bit with oiliness). if this is just a glimpse of what using this scalp treatment can do for my hair in general, both the feel and look, I am sold. All I really did was apply 4-5 lines of this treatment along a parted line like right at the roots after every time I showered and boom. I highly recommend trying this product.


Always Great
I like the texture of this. It's super lightweight and doesn't leave my hair feeling greasy or weighed down, which is usually my issue with scalp products. I've been massaging it in a few times a week, and it makes my scalp feel more hydrated. I haven't been using it long enough to notice a major difference in my scalp or hair health, but I have noticed my hair looking a little fuller since starting it. That might just be from more consistent care, but either way, it's a good sign. I love Olaplex products in general so I'm happy to keep this in the mix and give it more time. The bottle is easy to use and I like that I can apply it without messing up my hair. Looking forward to seeing how it performs over time.

