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Ultra Clean

Nighttime Scalp Serum

Sleep your way to better hair.
★★★★★4.9 · 214 reviews
$341 fl oz / 30ml

While you sleep, this amber-bottled overnight formula works on your scalp and strands. Aloe, castor, argan and lavender calm, nourish, and restore — so you wake up to visibly healthier hair from root to tip. No residue on your pillow, no buildup on your scalp.

Vegan
Cruelty free
Sulfate free
Fragrance free
Paraben free
Waterless
Family safe
Hypo-allergenic
Organic
95%
Scalp calm immediately
90%
Lush hair next morning
100%
No irritation reported
Hair type
Your StrandSense™ recommendation
Personalised for your hair profile.
View your full results →
Based on your StrandSense™ results, this wasn't your top pick — but it works for every hair type. See your recommended products →
1
Sustainability & packaging
+
Recycled & recyclable packaging
Post-consumer recycled materials. FSC-certified outer carton — fully recyclable kerbside.
No filler ingredients — waterless formula
We never dilute with water. Every ingredient earns its place. Less waste, better results.
Fair trade shea butter — Ghana
Sourced from female farmers in Ghana under verified fair trade terms.
Fair trade argan oil — Morocco
From a female-led cooperative in Morocco. Cold-pressed, sustainably harvested.

The Nighttime Scalp Serum works on two levels simultaneously: soothing and restoring the scalp environment while feeding nutrients into the hair shaft overnight. Healthy hair starts at a healthy scalp — this formula addresses both.

  • Soothes irritation, dryness, and inflammation at the scalp
  • Feeds nutrients into the hair shaft during overnight absorption
  • Castor oil promotes circulation and supports healthy growth
  • Lavender provides antimicrobial benefits without synthetic fragrance
  • Non-greasy — absorbs fully by morning with no residue
2023
Cosmopolitan Clean Beauty Award
Clean Beauty Category Winner
2021
Harper's Bazaar Hair Award
Best Bond Treatment
2021
Delicious Living Consumer & Retailer Choice
Best Clean Haircare
2020
Refinery29 Beauty Innovator Award
Beauty Innovator of the Year
2020
Grammy Awards & Met Gala
Celebrity stylist featured product

Castor Oil — Rich in ricinoleic acid, promotes scalp circulation and supports hair follicle health. The backbone of the overnight repair system.

Argan Oil (Morocco) — Fair trade. Penetrates the hair shaft while you sleep to rebuild disulfide and ionic bonds.

Aloe Vera — Deeply calming and hydrating for the scalp. Reduces inflammation and dryness at the root.

Lavender (Naturally Derived) — Antimicrobial and soothing. Provides a gentle natural scent and supports scalp health without synthetic fragrance compounds.

Jojoba Oil — Balances scalp oil production overnight and prevents the overproduction that leads to buildup.

Step 1: Apply 4–6 drops to your fingertips.

Step 2: Section hair and massage directly into the scalp with gentle circular motions for 1–2 minutes.

Step 3: Work any remaining product through the hair lengths.

Step 4: Leave overnight. No rinsing required — the formula absorbs fully by morning.

Use 2–3 times per week or nightly for intensive scalp restoration.

Independent clinical trial, December 2023. Participants used the Nighttime Scalp Serum three times per week for four weeks.

  • 95% reported their scalp felt calmer immediately after first application
  • 90% woke up with noticeably more lush, hydrated hair
  • 100% reported no irritation, allergic reaction, or adverse effects
  • Participants with dry scalp conditions saw the most significant improvements

Free standard shipping on orders over $50. Orders ship within 1–2 business days. Express shipping available at checkout.

Free returns within 30 days. If you're not completely satisfied, contact us and we'll make it right.

15 questions  ·  3 minutes  ·  Personalised routine  ·  Free
The routine

Use it your way.

01
Apply to clean scalp
Apply 4–6 drops directly to scalp sections before bed. Use fingertips to distribute across the full scalp, not just the hair.
02
Massage for 2 minutes
Massage in circular motions. This stimulates microcirculation and ensures the castor and argan actives penetrate to the follicle level.
03
No rinse needed
Leave overnight. The formula absorbs completely and won't transfer to pillowcases. Use a silk pillowcase for extra protection.
04
Use 2–3 nights per week
Consistency drives results. Most users notice improved scalp condition in 2 weeks and measurable growth improvement at 6–8 weeks.
Awards & recognition
Harper's Bazaar — 2022 Best Overnight Scalp Oil
Mind Body Green — 2023 Best Overnight Hair Growth Serum
Prevention Magazine — 2025 Best Soothing Hair Growth Serum
StrandSense™ by NUELE

Not sure which products
your hair actually needs?

15 questions. 3 minutes. A personalised NUELE routine built around your exact hair type, damage history, and goals.

What's inside

Nothing to hide.

Every ingredient was chosen for what it does to the scalp and the root — where hair health actually begins. No synthetic fragrance. Nothing that irritates.

Castor Oil
Certified Organic
Ricinoleic acid promotes scalp microcirculation, strengthens follicles, and supports the natural growth cycle. The anchor of the overnight repair system.
★ Hero
Argan Oil
Morocco · Fair Trade
Penetrates while you sleep to rebuild ionic and disulfide bonds from the root outward. Adds deep moisture and lasting shine.
★ Hero
Aloe Vera
Certified Organic
Anti-inflammatory and deeply soothing. Calms irritation, reduces scalp dryness, and supports healthy pH balance throughout the night.
Active
Lavender
Naturally derived
Clinically studied for scalp health. Antimicrobial without synthetic fragrance — the scent you smell is the active at work.
Active
Jojoba Oil
Certified Organic
Balances sebum production overnight. Prevents both dryness and over-oiliness. Absorbs completely without residue by morning.
Active
Product formulation
Formulation · 100% naturally derived
Product texture
Texture — lightweight, non-greasy
Independent clinical trial · December 2023

The results
speak for themselves.

95%
Scalp felt calmer immediately
90%
Lush, hydrated hair next morning
100%
No irritation reported

Independent user study, December 2023. 24 participants used the Nighttime Scalp Serum 3 times per week for four weeks. Participants with scalp dryness and sensitivity reported the most significant improvements. Zero adverse reactions across all participants.

Lab analysis · Hair strand microscopy

See what changes.

Participants submitted hair strands before and after their trial period for independent laboratory microscopy analysis. What you see below is the structural change — not a filter, not a retouch.

Before
"Frayed cuticle and shredded shaft — typical of scalp-neglected hair with disrupted hydrogen bonds."
After 2 weeks
"Smooth intact shaft with flattened cuticle — disulfide and hydrogen bonds restored from root outward."
4.9
★★★★★
Based on 214 reviews
5 stars
195
4 stars
13
3 stars
4
2 stars
1
1 star
1
K
Kezia M.
March 2024
★★★★★
My scalp has never been this calm.
I have a sensitive scalp that reacts to almost everything. After two weeks of nightly use, the itching is gone, the flaking is gone, and my hair is noticeably thicker at the roots.
4A coily Sensitive scalp Scalp health ✓ Verified buyer
Helpful?
R
Renée D.
February 2024
★★★★★
I wake up to noticeably better hair every time.
I can feel the difference in my hair the morning after I use this. More moisture, less frizz at the roots, curls look more defined. Three nights a week and it's become non-negotiable.
3C curly Growth Overnight ✓ Verified buyer
Helpful?
D
Derek A.
January 2024
★★★★☆
Measurably faster growth.
I've been tracking my growth for a year. Since adding the Scalp Serum 2 months ago, I'm seeing about 0.5 inches more per month. The science on castor oil and circulation holds up.
2C wavy Hair growth Scalp health ✓ Verified buyer
Helpful?