Hydrolysed vs. Functional Keratin™: What's the Difference?

June 10, 2025|Natalie Harrison

Updated: November 2025

The complete science behind why not all keratin is created equal, and why Functional Keratin™ delivers real, lasting results

Not all keratin is created equal. And here's the science to prove it.

When it comes to strengthening hair, restoring elasticity, and boosting shine, keratin has long been the hero ingredient in everything from salon treatments to supermarket shampoos.

But as keratin continues to trend, a growing number of people are beginning to ask: what kind of keratin are we actually using, and does it work?

The answer lies in a fundamental difference between hydrolysed keratin and Functional Keratin™, two ingredients that sound similar but perform very differently.

At Kiri10, we work exclusively with Functional Keratin™ because it's not just a marketing term. It's science-backed, clinically proven, and seriously effective.

Let's break down exactly what the difference is, why it matters, and how it transforms your hair.

The Keratin Confusion: What Most People Don't Realise

What Is Hydrolysed Keratin?

Most mainstream beauty products use hydrolysed keratin, a form of keratin that has been broken down into smaller peptide fragments.

How it's made:

Keratin undergoes hydrolysis, a process that breaks the protein into progressively smaller pieces

The goal is to create molecules small enough to penetrate the hair surface

The theory:

These tiny molecules should be able to coat the hair and provide smoothness

Smaller = better penetration, right?

Here's the problem:

Because these peptide fragments are so small, they lose the structure that gives keratin its strength

They may coat the hair temporarily, but they don't have the integrity to repair it

The result is temporary smoothness that washes out after a few shampoos

You get a quick fix, not a real solution

Why Hydrolysed Keratin Fails

The fundamental flaw:

When you break keratin down too much, you destroy what makes it work

The disulfide bonds (the cross-links that create strength) are fractured

The protein no longer functions like real keratin

What actually happens:

Hydrolysed keratin sits on the hair surface

It creates a temporary coating that feels smooth

But it doesn't bond to damaged areas inside the hair

It doesn't rebuild anything

It simply masks the problem until your next wash

The Functional Keratin™ Difference: Science That Works

What Makes Functional Keratin™ Different

Functional Keratin™ maintains the complex protein structure that mimics natural keratin found in human hair, skin, and nails.

How it's different:

It's carefully extracted to preserve the disulfide bonds responsible for keratin's strength and resilience

Instead of breaking keratin into tiny fragments, it preserves the bio-identical protein chain

This means it actually functions like real keratin in your body

The critical difference:

Hydrolysed keratin = broken down, lost structure, temporary coating

Functional Keratin™ = preserved structure, bio-identical to human keratin, actual repair

How Functional Keratin™ Actually Works

Instead of sitting on the surface, Functional Keratin™ binds to the damaged sites within the hair's internal structure.

The three-level approach:

Level 1: Recognition
Your body recognises Functional Keratin™ as compatible with your own keratin

This biocompatibility is critical for absorption

Level 2: Penetration
Functional Keratin™ penetrates through the hair's cuticle to reach the cortex (where real damage occurs)

Level 3: Repair
It actively rebuilds and reinforces the protein structure from the inside out

This creates lasting strength, not temporary smoothness

The Science of Bio-Identical Protein

Functional Keratin™ achieves 91% bio-identity to human keratin.

What this means:

Your body sees it as compatible with your own keratin

It communicates directly with your keratin-producing cells

It doesn't just "condition," it regenerates

This is why results are so dramatic and lasting

Clinical Evidence: Functional Keratin™ vs. Hydrolysed Keratin

What the Research Shows

Functional Keratin™ has been tested in both laboratory and real-world settings.

The clinical results are significant:

43% reduction in hair loss within 60 days

17.61% improvement in hair cortex integrity (actual structural strength)

10.1% increase in skin elasticity (same keratin principles apply to skin)

Results are measurable, published, and peer-reviewed

Why Hydrolysed Keratin Studies Show Limited Results

When hydrolysed keratin is studied, results are typically:

Minimal and temporary
Limited to surface effects only
Not replicated in long-term studies
Often comparing against other hydrolysed products rather than showing actual structural improvement

The key difference: Functional Keratin™ produces measurable internal hair structure changes. Hydrolysed keratin produces temporary surface changes.

What This Means for Your Hair: Real Transformation

If You've Tried Keratin Before

If you've cycled through keratin treatments and still find yourself with brittle, tired strands, you're not imagining the disappointment.

You've likely been using hydrolysed keratin.

The experience:

Your hair feels smooth for a few days

Then it returns to how it was before

You wonder if any keratin product actually works

You feel like you're wasting money

This isn't a reflection on you or your hair. It's the limitation of hydrolysed keratin.

With Functional Keratin™

Real transformation happens at the molecular level.

What changes:

Stronger hair after every wash (not just for a day)

Hair that resists breakage and snapping

Hair that doesn't just look healthy but is structurally healthy

Hair that retains length better because it breaks less

Improved elasticity so hair stretches without snapping

Results that compound and improve over months

The difference:

Band-aid beauty (hydrolysed keratin) = temporary masking

Real transformation (Functional Keratin™) = lasting repair

Why Kiri10 Chose Functional Keratin™

Our Commitment to Real Results

We're not in the business of band-aid beauty. We're here for long-term, visible transformation, and that starts at the molecular level.

Why we exclusively use Functional Keratin™:

It actually works (we've seen the science and the customer results)

It delivers measurable transformation (43% hair loss reduction is significant)

It respects your time and money (one product that delivers, not a cycle of disappointments)

It aligns with our values (evidence-based, effective, honest)

The Complete System Approach

Functional Keratin™ works best as part of a complete system:

Internal Support (Capsules):
Provides bioavailable Functional Keratin™ your body can immediately use

Clinical studies show 43% hair loss reduction

External Support (Shampoo):
Gently cleanses with naturally-derived coconut surfactants

Protects Functional Keratin™ during washing

Strengthening (Conditioner):
Applies Functional Keratin™ directly where damage occurs

Locks in moisture and strength

Protection (Serum):
Guards against daily damage whilst providing ongoing keratin nourishment

Creates a comprehensive repair system

Using all four together creates synergistic results you can't get from any single product.

The Bottom Line: Quality Keratin Matters

What to Look For When Choosing Keratin

Ask these questions:

Is it Functional Keratin™ or just "hydrolysed keratin"?

Are there clinical studies backing the claims?

Has it been third-party tested?

Is there measurable evidence of results?

Do real customers report lasting transformation?

Red flags:

"Keratin" without specifying the type

Marketing claims without clinical evidence

Promises of overnight miracles

Only temporary shine without structural improvement

The Real Cost of Choosing Wrong

Using hydrolysed keratin seems cheaper upfront.

But here's the real cost:

You buy product after product chasing temporary results

Your hair never actually improves structurally

You spend more money long-term without seeing transformation

You lose confidence in whether any keratin product can actually work

The value of Functional Keratin™:

Higher upfront cost, but dramatically better value

One product that delivers measurable results

Long-term transformation that compounds over time

Real structural improvement, not temporary masking

References and Further Reading

The Effects of Oral Keratin Supplementation - ResearchGate - Clinical trial on Functional Keratin™ effectiveness
Effect of keraGEN IV Keratin Oral Supplementation - Lincoln Agritech - Research showing 43% hair loss reduction
keraGEN IV Clinical Study - Keraplast - Peer-reviewed research on Functional Keratin™
The Science of Functional Keratin - Kiri10 - Comprehensive guide to Functional Keratin™
Why New Zealand Keratin Is Superior - Kiri10 - Information on Functional Keratin™ sourcing
KiriGlow Keratin Supplement - Kiri10 - Functional Keratin™ supplement product
Keratin Supplement Reviews - Kiri10 - Real customer results with Functional Keratin™
Hair Structure and Keratin - PMC - Scientific overview of keratin's role in hair

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Frequently Asked Questions

Hydrolysed keratin is broken into small peptide fragments that coat the surface temporarily but don't repair internal structure. Functional Keratin™ maintains its complex protein structure and achieves 91% bio-identity to human keratin, allowing it to penetrate and repair from inside out. The key difference is structure, not just size.

Initial improvements (hair feeling slightly stronger, less breakage) appear within 2-4 weeks. Visible hair quality improvements show by 8-12 weeks. Most dramatic transformation occurs by 3-6 months of consistent use. Results compound and improve over time.

Hydrolysed keratin can provide temporary smoothness and shine for a few days. For that immediate effect, it works. But if you're looking for lasting structural repair and strength improvement, hydrolysed keratin cannot deliver. It's fundamentally limited by its broken structure.

The extraction and preservation process is more complex and expensive. Third-party testing and clinical research add cost. But the real value is in results, not price. One bottle of Functional Keratin™ that delivers transformation costs less long-term than multiple bottles of hydrolysed keratin that delivers nothing.

Yes. Functional Keratin™ is safe for all hair types including colour-treated, curly, fine, and thick hair. It strengthens without weighing down or becoming stiff. Results are noticeable regardless of hair type.

Yes. Functional Keratin™ works well with other hair health supplements and treatments. In fact, combining internal Functional Keratin™ with topical support (shampoo, conditioner, serum) and nutritional support (biotin, zinc, omega-3s) creates synergistic results.

Look for the label specifically stating "Functional Keratin™" or the keraGEN-IV™ formulation. Check for clinical studies backing the claims. Look for third-party testing verification. Real Functional Keratin™ products provide transparency about their sourcing and testing.

Hydrolysed keratin is cheaper and faster to produce. Many companies prioritise cost over effectiveness. Functional Keratin™ requires more investment in extraction, testing, and research. Companies committed to real results choose Functional Keratin™ despite higher costs.

Both are proteins, but keratin specifically targets hair, skin, and nails. Collagen supports skin elasticity and joint health. For hair repair specifically, Functional Keratin™ is far superior because it's bio-identical to hair structure. Using both together creates comprehensive support.

Not completely. Functional Keratin™ creates lasting structural repair in your hair. Stopping supplementation means you stop receiving new keratin support, but the repair that occurred remains. However, consistent use maintains ongoing improvement and prevents new damage.