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Ultra Clean

Hair Serum

Your everyday everything.
★★★★★4.9 · 214 reviews
$342 fl oz / 60ml

Five 100% naturally derived ingredients that protect, moisturise, and repair every single day. Weightless enough to use before your blowout, powerful enough to transform your hair in two weeks. Safe for colour-treated, chemically processed, and natural hair of every texture.

Vegan
Cruelty free
Sulfate free
Fragrance free
Paraben free
Waterless
Family safe
Hypo-allergenic
Organic
100%
Less breakage before heat styling
91%
Easier manageability in 2 weeks
0%
Reported irritation
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 Hair Serum targets all three hair bond types — hydrogen, disulfide, and ionic — to deliver comprehensive protection and repair in a single daily product. Apply it before heat styling and it forms a protective shield around each strand; use it as a leave-in and it continues restoring bonds throughout the day.

  • Pre-heat protection up to 450°F
  • Rebuilds disulfide bonds weakened by chemical and heat damage
  • Seals the cuticle for lasting smoothness and reduced frizz
  • Locks in colour vibrancy through improved ionic bonding
  • Weightless — no residue or buildup on any texture
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

Argan Oil (Morocco) — Fair trade, cold-pressed. Rich in oleic and linoleic acids that penetrate the hair cortex to rebuild disulfide bonds and restore structural integrity.

Jojoba Oil — Mirrors the hair's natural sebum. Deeply moisturising, balances scalp oil production, reduces breakage.

Castor Oil — High in ricinoleic acid. Strengthens the hair shaft, promotes growth, and adds intense shine.

Vitamin E — Antioxidant protection that shields bonds from free radical damage caused by UV, heat, and pollution.

Aloe Vera — Soothes the scalp, hydrates the strand, and supports the hair's natural pH balance.

Daily use: Apply 2–3 drops to damp or dry hair, focusing on mid-lengths and ends. Style as usual. No rinsing required.

Pre-heat: Apply to damp hair before blow-drying or using any heat tool. Provides protection up to 450°F.

Best results: Use daily for 2 weeks to see measurable improvement in manageability and breakage reduction.

Independent clinical trial, December 2023. Participants used the Hair Serum daily for two weeks. Hair strands were submitted to an independent laboratory for microscopy analysis before and after.

  • 100% of participants reported less breakage before heat styling
  • 91% noticed improved manageability after two weeks
  • Microscopy showed measurably smoother cuticle after use
  • 0% reported any irritation, allergic reaction, or adverse effect

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
Before heat styling
Apply 2–3 drops to damp hair before blow-drying or flat-ironing. Protects bonds up to 450°F and distributes evenly through mid-lengths and ends.
02
On dry hair
A few drops smoothed through dry hair tames frizz, adds shine, and refreshes your style without re-washing. Perfect mid-week reset.
03
As a treatment
Apply 5–6 drops to damp hair, cover with a warm towel for 10 minutes, then style as usual. Use 1–2× per week for intensive repair.
04
As an overnight mask
Apply generously before bed. Cover with a silk cap. Rinse in the morning. Targeted treatment for heavily damaged or very dry hair.
Awards & recognition
Cosmopolitan — 2023 Clean Beauty Award — Best Hair Oil
Harper's BAZAAR — 2021 Hair Award
Refinery29 — 2020 Beauty Innovator Award
Delicious Living Magazine — 2021 Beauty & Body Awards — Consumer Choice & Retailer Choice
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.

Five ingredients. That's it. Every one has a clinical reason to be here — nothing to pad the list, extend shelf life, or add synthetic shine.

Argan Oil
Morocco · Fair Trade
Rebuilds disulfide bonds. Rich in oleic and linoleic acids that penetrate the cortex to restore structural integrity and deep shine.
★ Hero
Castor Oil
Certified Organic
Ricinoleic acid promotes scalp circulation and strengthens the hair shaft from the root. Adds thickness and resilience.
★ Hero
Jojoba Oil
Certified Organic
Mirrors the hair's natural sebum. Seals the cuticle, reduces moisture loss, and provides lasting softness without heaviness.
Active
Vitamin E
Plant-derived
Antioxidant shield that protects all three bond types from UV, heat, and pollution damage. Preserves bond integrity over time.
Active
Aloe Vera
Certified Organic
Hydrates, soothes, and balances scalp pH. Supports the hair's natural moisture retention cycle.
Active
Product formulation
Formulation · 100% naturally derived
Product texture
Texture — lightweight, non-greasy
Independent clinical trial · December 2023

The results
speak for themselves.

100%
Less breakage before heat styling
91%
Improved manageability in 2 weeks
0%
Irritation or adverse reaction

Independent user study, December 2023. 32 participants across all hair types. Results include user feedback and independent laboratory microscopy of submitted hair strands before and after the two-week trial.

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
"Raised cuticle and microbreakage along the strand — characteristic of heat-damaged hair with weakened disulfide bonds."
After 2 weeks
"Sealed cuticle, measurably reduced breakage — disulfide bonds restored, strand integrity recovered."
4.9
★★★★★
Based on 214 reviews
5 stars
195
4 stars
13
3 stars
4
2 stars
1
1 star
1
T
Tamara J.
March 2024
★★★★★
Finally something that actually works for 4C hair.
I've been through everything. This is the first product that reduces my breakage without leaving residue. My hair is softer, less brittle, and I can see the difference when I detangle. On my third bottle.
4C coily Breakage Daily use ✓ Verified buyer
Helpful?
S
Sophie R.
February 2024
★★★★★
Lightweight enough for fine wavy hair. Finally.
I have 2A waves and fine strands — most serums weigh my hair flat. This doesn't. My waves are more defined, frizz controlled, zero build-up. The clean ingredient list was the reason I tried it.
2A wavy Fine hair Clean beauty ✓ Verified buyer
Helpful?
M
Marcus B.
March 2024
★★★★★
My hairdresser commented before I said anything.
Two weeks in she asked what I'd changed. Less breakage, more shine, healthier ends. I use it every day before I blow dry.
3B curly Heat protection Shine ✓ Verified buyer
Helpful?