Undenatured Type II vs Hydrolysed Collagen for Dogs: What’s the Difference?
By VeraPaws Editorial Team·16 min read
Quick Answer
Undenatured Type II collagen and hydrolysed collagen are not two names for the same ingredient.
They differ in their structure, processing, typical serving amounts and the way researchers think they may act in the body.
Undenatured Type II collagen is processed to preserve much of its native collagen structure.
Several canine studies have investigated branded UC-II preparations in dogs with osteoarthritis, often at relatively small daily amounts.
The proposed mechanism centres on oral tolerance, an immune process associated with recognition of intact Type II collagen structures.
Hydrolysed collagen takes almost the opposite processing approach.
Collagen is deliberately broken into much smaller peptides and amino acids.
Recent veterinary research has investigated these collagen hydrolysates as nutritional support for dogs with osteoarthritis, with some encouraging findings but an evidence base that is still developing.
Type II tells you what collagen type you are looking at. Undenatured or hydrolysed tells you how that collagen has been processed.
And that means research on one form should not automatically be used as proof for the other.
Key Takeaways
Undenatured Type II collagen and hydrolysed collagen are different ingredients.
Type II describes a collagen type.
Undenatured describes preservation of the collagen’s native structure.
Hydrolysed means the collagen has been broken into smaller peptides.
UC-II is a specific branded form of undenatured Type II collagen used in several canine studies.
It is not a generic name for every Type II collagen supplement.
Undenatured Type II collagen is generally studied at much smaller amounts than collagen hydrolysates.
That does not mean one is automatically more potent than the other.
Their quantities should not be compared milligram for milligram.
Canine research exists for both undenatured Type II collagen and hydrolysed collagen.
Neither evidence base justifies saying one is universally better for every dog.
VeraPaws Hip & Joint Collagen For Dogs uses an 88% hydrolysed collagen foundation.
It does not contain undenatured Type II collagen.
Evidence from UC-II studies should therefore not be presented as evidence for the VeraPaws Hip & Joint formula.
First, “Type II” and “Undenatured” Are Not the Same Thing
This is the most important distinction in the whole article.
A collagen label can describe different things.
Collagen Type
These describe different collagen proteins and where they are commonly found in the body.
Type I.
Type II.
Type III.
Collagen Processing
These words tell you something about what has happened to the collagen during manufacturing.
Undenatured.
Native.
Hydrolysed.
So:
Type II collagen is not automatically undenatured collagen.
And:
hydrolysed collagen is not automatically Type I or Type III.
A Type II collagen can also be processed differently.
Always ask two questions: What collagen type is it? And what form is it in?
What Is Undenatured Type II Collagen?
Type II collagen is a major structural collagen in articular cartilage.
When Type II collagen is described as undenatured, processing has been controlled to preserve important aspects of its native three dimensional structure rather than deliberately breaking the collagen into small peptides.
The veterinary literature commonly discusses undenatured Type II collagen derived from chicken sternum cartilage.
UC-II is one trademarked ingredient that has been investigated in multiple canine studies.
That distinction matters because the proposed effect of undenatured Type II is tied to structural features that hydrolysis is intended to break apart.
How Is Undenatured Type II Thought to Work?
The proposed mechanism is known as oral tolerance.
Rather than thinking of undenatured Type II as simply providing a large quantity of collagen building blocks, researchers have proposed that small amounts of preserved Type II collagen interact with immune tissue associated with the gut.
Preclinical research suggests this may influence regulatory immune responses associated with Type II collagen in cartilage.
This mechanism is still an area of research.
It is more responsible to say:
Undenatured Type II is believed to work partly through an oral tolerance mechanism.
rather than suggesting that swallowing Type II collagen simply sends intact collagen directly into the dog’s joints.
What Is Hydrolysed Collagen?
Hydrolysed collagen is intentionally processed in a very different way.
The collagen protein is broken down into much smaller collagen derived peptides.
A recent veterinary review describes collagen hydrolysates as mixtures of collagen derived oligopeptides and amino acids, typically with substantially lower molecular weights than native collagen.
After ingestion, they are absorbed predominantly as amino acids and smaller peptides.
BREAKING THE COLLAGEN DOWN IS THE POINT.
This is why it would be misleading to judge hydrolysed collagen according to whether it retains the intact structure required by the proposed undenatured Type II mechanism.
They are different nutritional approaches.
Undenatured Type II vs Hydrolysed Collagen at a Glance
Undenatured Type II
Hydrolysed Collagen
What does the name describe?
Collagen type + preserved structure
Processing method
Structure
Largely preserved native structure
Broken into smaller peptides
Common studied source
Chicken cartilage in many UC-II studies
Can come from bovine, marine and other collagen sources
Typical amount studied
Often relatively small milligram quantities
Frequently much larger peptide amounts
Proposed pathway
Oral tolerance / immune signalling
Digested and absorbed collagen peptides and amino acids
Canine joint research
Yes
Yes
Are they interchangeable?
No
No
Does one automatically beat the other?
No
No
Swipe to compare →
They are both called collagen. That does not make them the same supplement.
Why Are the Doses So Different?
This can be confusing when owners start comparing labels.
A product containing undenatured Type II might list an amount measured in milligrams.
A hydrolysed collagen product may provide collagen in grams.
It can therefore look as though one product contains dramatically “more” or “less” of the relevant joint ingredient.
But the numbers are not directly comparable.
Studies of undenatured Type II have used relatively small daily quantities because the proposed mechanism is not simply to provide large amounts of collagen derived protein.
For example, an early canine study investigated small daily UC-II quantities in arthritic dogs over 90 days.
Another canine trial evaluated UC-II alongside glucosamine and chondroitin over 150 days.
By contrast, canine collagen hydrolysate trials have used much larger amounts, including fixed gram quantities or body weight based peptide amounts.
Our Approach
DO NOT COMPARE THE NUMBERS WITHOUT COMPARING THE FORM.
Milligrams of undenatured Type II and grams of hydrolysed collagen are not competing versions of the same dose.
What Does the Canine Research Say About Undenatured Type II?
There is genuine dog specific research.
An early study involving arthritic dogs evaluated different amounts of UC-II over 90 days and reported reductions in measures of pain and exercise associated lameness in dogs receiving the supplement.
The study was small, which limits how confidently its findings can be generalised.
A later study compared placebo, UC-II, glucosamine plus chondroitin, and a combination of those ingredients in arthritic dogs over 150 days.
Both subjective pain assessments and objective force plate measurements were included.
The study reported improvements in the UC-II group, although group sizes were relatively small.
Another prospective study compared UC-II with robenacoxib in dogs with osteoarthritis.
Mobility scores improved in both groups.
That is interesting evidence, but it should not be turned into a broad claim that a collagen supplement can replace veterinary pain medication.
More recent studies have also investigated products combining undenatured Type II with other ingredients.
Those studies cannot tell us what undenatured Type II alone contributed if several active ingredients were used.
Is All Undenatured Type II Collagen the Same?
No.
This is another important label issue.
Much of the research owners see referenced online involves UC-II, which is a specific branded ingredient.
That should not automatically be transferred to every supplement that simply prints:
“Type II collagen”
or:
“undenatured Type II collagen”
on its label.
Research comparing commercial Type II collagen ingredients has reported meaningful differences between products labelled as undenatured.
The authors cautioned against assuming that all such ingredients are interchangeable.
Ingredient form matters. Ingredient identity matters too.
What Does the Research Say About Hydrolysed Collagen for Dogs?
Hydrolysed collagen has its own canine research.
A recent veterinary narrative review identified several clinical studies investigating collagen hydrolysates in dogs with osteoarthritis.
The authors described the evidence as promising, particularly around reported changes in lameness, but also highlighted important limitations including:
Relatively few high quality trials
Different collagen preparations
Inconsistent doses
Different outcome measures
A need for better canine bioavailability research
That is an important balance.
Hydrolysed collagen is not an evidence free ingredient.
But we should not present every hydrolysed collagen powder as clinically proven simply because one specific peptide product performed well in a study.
What Happened in the 2024 Hydrolysed Collagen Study?
One of the stronger recent trials involved dogs with naturally occurring osteoarthritis.
Thirty one dogs completed the 12 week study.
Researchers used:
force plate gait measurements
owner questionnaires
accelerometers measuring daily activity
Dogs receiving specific bioactive collagen peptides showed improvements in several force plate parameters and owner assessed quality of life.
Daily activity measured by accelerometer did not significantly improve.
THE STUDY SUPPORTS THAT SPECIFIC COLLAGEN PEPTIDE PREPARATION.
It does not prove that every hydrolysed collagen formula produces identical outcomes.
Which Has Better Evidence: Undenatured Type II or Hydrolysed Collagen?
There is no clean answer that allows us to declare a universal winner.
Undenatured Type II has several canine studies, including controlled trials.
Hydrolysed collagen also has canine clinical research, including recent placebo controlled work using objective gait measurements.
But both bodies of research contain limitations.
A systematic review of nutraceuticals used in canine and feline osteoarthritis found that evidence for collagen based nutraceuticals was limited by the quality and size of available studies at that time.
Canine osteoarthritis consensus guidance has also treated undenatured Type II as a possible supplementary option rather than a universally established core intervention.
Different evidence. Different forms. No scientifically established universal winner.
Has Undenatured Type II Been Compared Directly With Hydrolysed Collagen in Dogs?
I have not found a good canine clinical trial that directly randomises dogs between:
undenatured Type II collagen
hydrolysed collagen peptides
under the same study conditions.
That matters.
Without a genuine head to head comparison, we should be careful about claims such as:
“UC-II is better than hydrolysed collagen.”
or:
“Hydrolysed collagen is better than Type II.”
Those conclusions require evidence that directly answers that question.
The current literature largely studies the ingredients separately.
Is Type II Automatically Better for Joints Because Cartilage Contains Type II?
No.
This is an appealing argument:
“Joint cartilage contains Type II collagen, therefore dogs should take Type II collagen.”
But nutritional biology is not quite that simple.
The collagen a dog eats is not inserted whole into cartilage.
And different collagen supplements are being used according to different proposed mechanisms.
Undenatured Type II is investigated partly for its preserved structure and proposed oral tolerance pathway.
Hydrolysed collagen is deliberately digested into peptide and amino acid components and has its own body of joint research.
CARTILAGE CONTAINS TYPE II.
That is true.
THEREFORE EVERY JOINT SUPPLEMENT MUST CONTAIN TYPE II.
That conclusion does not automatically follow.
Does Hydrolysed Collagen Need to Contain Type II to Support Joint Nutrition?
No universal evidence establishes that requirement.
Recent canine collagen hydrolysate research includes products that are not simply undenatured Type II ingredients.
The veterinary review of collagen hydrolysates discusses several peptide based approaches and describes potential effects involving collagen metabolism, cartilage and other joint tissues.
The relevant question is not simply ‘Does it say Type II?’
It is:
“What exact collagen form is this, what amount is used, and does the research actually match that ingredient?”
Where Hip & Joint Collagen For Dogs Fits
This distinction is particularly important for VeraPaws.
The collagen foundation includes Australian grass fed hydrolysed bovine collagen alongside wild caught marine collagen peptides made in Australia.
We then add MSM, glucosamine sulphate and chondroitin sulphate as purposeful supporting ingredients.
Collagen forms the foundation. Supporting ingredients complete the routine.
Why Is VeraPaws Clear About Not Containing Undenatured Type II?
Because evidence should match the ingredient.
If we cited a UC-II study and then implied it proved the effectiveness of Hip & Joint Collagen For Dogs, we would be transferring evidence from one form of collagen to another.
We do not think that is good evidence practice.
Likewise, a company selling undenatured Type II should not use a hydrolysed collagen peptide trial as though it directly proves its product.
MATCH THE RESEARCH TO THE FORMULA.
That is one of the simplest ways to evaluate supplement claims.
Does That Mean Hip & Joint Collagen For Dogs Is Missing Something?
No.
It means it uses a different formulation strategy.
There is no universal rule that every joint supplement must contain undenatured Type II.
VeraPaws uses hydrolysed collagen as the main nutritional foundation and adds glucosamine, MSM and chondroitin around it.
Another product may choose undenatured Type II as its central ingredient.
Both approaches should be evaluated according to:
the ingredient actually used
the amount
the quality of the research
the rest of the formula
the dog using it
Different does not mean incomplete. It means different formulation logic.
Can a Dog Take Hydrolysed Collagen and Undenatured Type II Together?
Potentially, because they are not simply duplicate forms of the same nutritional dose.
But that does not automatically mean every dog needs both.
If you are combining multiple joint products, first check for overlapping:
glucosamine
chondroitin
MSM
omega 3 ingredients
botanicals
other joint nutrients
And if your dog has diagnosed osteoarthritis, takes medication, has other health conditions or is experiencing significant pain, involve your veterinarian in the overall plan.
Do Not Compare Them Milligram for Milligram
This deserves repeating because supplement labels make it easy to get wrong.
Imagine:
Product A
40 mg undenatured Type II ingredient.
Product B
3,000 mg hydrolysed collagen peptides.
It would be wrong to conclude:
“Product B must be 75 times better.”
It would also be wrong to conclude:
“Product A only needs milligrams, therefore it is 75 times more powerful.”
The quantities reflect fundamentally different ingredient forms and formulation approaches.
Compare like with like before comparing the number.
What Should You Look for on the Label?
What Collagen Type?
I?
II?
III?
A combination?
What Collagen Form?
The word “collagen” alone is not enough.
Undenatured?
Hydrolysed?
Is “UC-II” Actually UC-II?
UC-II refers to a specific branded ingredient used in published research. Do not assume every generic Type II ingredient is identical.
How Much Is Included?
Look for an actual amount or transparent percentage.
Does the Research Match the Ingredient?
A hydrolysed collagen study does not prove an undenatured product. A UC-II study does not prove a hydrolysed collagen powder.
What Else Is in the Formula?
Collagen may be one part of a broader joint routine.
How Is It Served?
Does the label make the daily amount clear?
What Is the Dog Actually Being Supported For?
Those are not necessarily the same use case.
General daily nutrition?
Movement?
Diagnosed osteoarthritis?
Do not stop at ‘contains collagen’. Find out which collagen.
What About Dogs With Osteoarthritis?
Both undenatured Type II and hydrolysed collagen have been investigated in dogs with osteoarthritis.
But osteoarthritis is a medical condition.
Neither form of collagen should be positioned as a cure.
Veterinary management may also involve:
weight management
suitable exercise
rehabilitation
environmental changes
veterinary pain management
other nutritional strategies
Collagen may sit within that broader routine.
It should not delay assessment of a dog that is clearly uncomfortable.
When Should You See a Vet?
Speak with your veterinarian if your dog has:
persistent limping
obvious pain
sudden mobility changes
difficulty getting up
reluctance to bear weight
unexplained swelling
significant change in activity
worsening symptoms
A supplement label cannot tell you why the dog is struggling to move.
What Australian Dog Owners Should Remember
Type II Is a Collagen Type
It does not automatically tell you whether the collagen is undenatured.
Undenatured Describes Structure
Its proposed joint effect is linked to preservation of native collagen characteristics.
Hydrolysed Describes Processing
The collagen has deliberately been broken into smaller peptides.
The Doses Are Not Directly Comparable
Milligrams of undenatured Type II and grams of hydrolysed collagen represent different approaches.
Both Have Canine Research
Neither has evidence strong enough to justify a universal winner for every dog.
UC-II Is a Specific Ingredient
Do not assume every Type II product is equivalent to material used in UC-II studies.
The Research Should Match the Label
Do not borrow evidence from another collagen form.
VeraPaws Hip & Joint Uses Hydrolysed Collagen
It contains an 88% hydrolysed collagen foundation plus MSM, glucosamine sulphate and chondroitin sulphate.
The question is not simply ‘Does it contain Type II?’ The question is ‘What collagen is this, what form is it in, and does the evidence match?’
Frequently Asked Questions
Is Type II collagen the same as undenatured collagen?
No.
Type II describes the collagen type.
Undenatured describes how the collagen structure has been preserved during processing.
Is Type II collagen the same as UC-II?
Not necessarily.
UC-II is a specific branded undenatured Type II collagen ingredient used in a number of published studies.
A generic Type II collagen ingredient should not automatically be assumed to be identical.
What is hydrolysed collagen?
Hydrolysed collagen has been broken into smaller collagen derived peptides.
After ingestion, those peptides are further digested and absorbed mainly as amino acids and smaller peptide fragments.
Which is better for dogs, UC-II or hydrolysed collagen?
Current evidence does not establish one as universally better for every dog.
Both have canine research, but they are different ingredients investigated using different doses, study designs and proposed mechanisms.
Why is UC-II used in such small amounts?
Undenatured Type II is proposed to work partly through oral tolerance rather than by supplying large gram quantities of collagen derived protein.
That is why its studied serving amounts can be much smaller than hydrolysed collagen doses.
Does more hydrolysed collagen mean it is better than Type II?
No.
The gram or milligram quantities cannot be directly compared because the ingredient forms and intended mechanisms are different.
Does cartilage contain Type II collagen?
Yes.
Type II collagen is a major collagen component of articular cartilage.
That does not mean every joint supplement must contain undenatured Type II.
Does Hip & Joint Collagen For Dogs contain Type II collagen?
No.
Hip & Joint Collagen For Dogs currently contains hydrolysed bovine collagen Types I and III and hydrolysed marine collagen Type I.
It does not contain undenatured Type II collagen.
How much collagen is in Hip & Joint Collagen For Dogs?
88% of the formula is hydrolysed collagen peptides.
The remaining formula contains MSM, glucosamine sulphate and chondroitin sulphate.
Can dogs take hydrolysed collagen and UC-II together?
Potentially, but combining supplements is not automatically necessary.
Check the complete formulas for overlapping ingredients and discuss the routine with your veterinarian where your dog has diagnosed joint disease or takes medication.
Has hydrolysed collagen been studied in dogs?
Yes.
Several canine studies have investigated collagen hydrolysates, including a 2024 placebo controlled trial using objective force plate gait measurements.
The evidence is encouraging but still developing.
Has undenatured Type II been studied in dogs?
Yes.
Multiple canine studies have investigated undenatured Type II collagen in dogs with osteoarthritis, although study size and methodology vary considerably.
Different collagen types and forms are not interchangeable.
VeraPaws Hip & Joint Collagen For Dogs starts with an 88% hydrolysed collagen foundation, then adds glucosamine sulphate, MSM and chondroitin sulphate for purposeful daily movement support.
