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Spring Essentials
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Olaplex N°0.5 Scalp Longevity Treatment, Main, color,
Olaplex N°0.5 Scalp Longevity Treatment, Alternate, color,
Olaplex N°0.5 Scalp Longevity Treatment, Alternate, color,
Olaplex N°0.5 Scalp Longevity Treatment, Alternate, color,
Olaplex N°0.5 Scalp Longevity Treatment, Alternate, color,

N°0.5 Scalp Longevity Treatment

Olaplex

$44.00Current Price $44.00
1.7 oz
Free returns anytime
Sold by Nordstrom
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Details & care

What it is: A balancing, strengthening, anti-aging scalp serum to protect hair health.

Who it's for: Ideal for all hair and scalp types.

What it does: The scalp ages faster than all other skin and can directly affect hair health. Smooth, shiny, healthy hair starts with a healthy scalp. This weightless scalp serum immediately hydrates and soothes the scalp as it protects against accelerated scalp aging to promote hair health over time. It's trichologist approved and dermatologist tested. The serum immediately hydrates and soothes the scalp, strengthens and protects the scalp barrier and microbiome, and promotes soft, shiny and visibly healthy hair.

Research results:

Based on a 16-week dermatologist-supervised clinical test of 25 participants:

- 80% said scalp felt nourished after just one use

- 51% improved scalp barrier in 14 days

- Scalp was immediately 5X more hydrated

How to use: Part hair with needlenose applicator. Squeeze gently and apply directly to scalp. Continue for as many sections as needed. The 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.

  • Made in the USA
  • Item #10871764

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Olaplex

This brand is part of BEAUTYSPACE, a global beauty destination offering a carefully edited selection of the world's most innovative beauty products, including cosmetics, skin care and tools. Since its founding in 1993, it has given emerging brands access to a broader market—through Nordstrom and other prominent retailers. Today, BEAUTYSPACE encompasses more than 70 global brands.

Reviews

(334)
4.7 out of 5
Write a Review

Most helpful positive review

Mar 23, 2026
Feels great on my scalp
One of the biggest strengths of this treatment is its focus on scalp health as the foundation of hair health. Many products prioritize shine or softness of the hair itself, but OLAPLEX No. 0.5 shifts attention to the environment where hair grows. With continued use, the scalp feels more balanced—less dry, less irritated, and noticeably calmer. For those who struggle with itchiness or tightness, this can be a significant improvement. It doesn’t feel like a harsh or medicated solution; instead, it works gradually to restore comfort.
Jazzyjuggz10
Reposted from OLAPLEX

Most helpful critical review

Feb 16, 2026
Smells Awful
it wreaks! put my cat on edge trying to figure out the disturbing smell, as well as myself. I thought mine had gone bad until I read the other reviews. smells absolutely awful.
KMCC
Reposted from OLAPLEX
5 stars
77%
4 stars
18%
3 stars
3%
2 stars
2%
1 star
1%

Pros:

Cons:

Current reviews don’t mention any.
Sort by Most Helpful
Size
Jazzyjuggz10
Reposted from OLAPLEX
Mar 23, 2026
Feels great on my scalp
One of the biggest strengths of this treatment is its focus on scalp health as the foundation of hair health. Many products prioritize shine or softness of the hair itself, but OLAPLEX No. 0.5 shifts attention to the environment where hair grows. With continued use, the scalp feels more balanced—less dry, less irritated, and noticeably calmer. For those who struggle with itchiness or tightness, this can be a significant improvement. It doesn’t feel like a harsh or medicated solution; instead, it works gradually to restore comfort.
KMCC
Reposted from OLAPLEX
Feb 16, 2026
Smells Awful
it wreaks! put my cat on edge trying to figure out the disturbing smell, as well as myself. I thought mine had gone bad until I read the other reviews. smells absolutely awful.
Darby
Reposted from OLAPLEX
Feb 15, 2026
Invest in your haircare
I have been using for over six months… my hair is stronger. Excellent for menopause women’s and hair coloring ! Good investment
Laurel
Reposted from OLAPLEX
Feb 12, 2026
Intolerable smell
This product smells awful. Like the yeast byproducts of making beer or worse. I literally couldn’t sleep after trying it for an overnight treatment, it was that strong and that bad. I was really stunned because everything else I’ve tried from Olaplex has a pretty mild pleasant/neutral scent (No. 3, 4, 5, 5 leave-in, 6, 7, 8, 9). Returning this; even if it somehow provides good benefit to the scalp there is no way I could tolerate that smell ever again. The bottle even suggests you could use it as part of your styling routine— go out in public after applying that?! Absolutely not. Anyway, I do not normally write reviews but I wanted to provide this PSA to y’all— do not waste your money on this one. Will stick with my other Olaplex faves; I do highly recommend No. 4, 5, 5 leave-in, 7, and 9.
Anonymous
Reposted from spacenk.com
Jan 29, 2026
Nice
I have just started using this scalp serum and after only using for a short while, I have already seen results. My scalp can get quite dry/flakey and irritated and since using this serum I no longer get the flakes on my scalp, it feels really nourished and not itchy. The only fault is that the serum smells awful like rotten eggs, the smell does fade after an hour or so but I guess it is the price you pay for a product with actual ingredients that will work!
Ary97
Reposted from OLAPLEX
Jan 29, 2026
Why this smell so bad as a old cheese. It's my first time using this but for this price unless should smell a little bit better
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N°0.5 Scalp Longevity Treatment
Olaplex
$44.00Current Price $44.00