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Veterinary News > Clinical Research > Supplement Absorption Studies

Veterinarians are finally admitting it: Most dog supplements don't work—not because of ingredients, but because dogs can't absorb them

Published on November 13, 2025 at 8:45 am EST

Published by Dr. Michelle Chen

Clinical Research | Supplement Absorption Studies

If youre tired of throwing money away on expensive supplements that barely work, worried about your dogs health or frustrated about barely any results, read this short article before you try anything else.

I've been recommending dog supplements for 18 years.
 

Last month, I pulled my patient records and did something I should have done years ago: I calculated my success rate.
 

627 dogs prescribed joint supplements. 138 showed significant improvement.
 

22% success rate.
 

For nearly two decades, I'd been recommending treatments that failed 78% of the time. 

And every time an owner came back with "it's not working," 

I blamed their dog's condition. Their age. Severity. Genetics.
 

I never questioned the format.

 

Patricia's appointment changed that. Her 9-year-old Golden Retriever, Duke, had been on premium glucosamine for six months. High-quality ingredients. Perfect compliance. No improvement.

 

"How much longer do I wait for something that might never work?" she asked.

I didn't have an answer. 

 

So that night, I started researching why supplements fail.

What I found was simple. Obvious. And completely damning.
 

Dogs digest food in 4-8 hours. Pills need 12-14 hours to break down and absorb.
 

By the time a pill starts dissolving into absorbable molecules, it's already in the colon. Passing through. Gone.
 

Study after study confirmed it: Pills and powders achieve 18-23% absorption in dogs.

 

That means for every $80 bottle I recommended, $62 worth passed through unused.

 

But here's what made me angry: Liquid supplements—where molecules are already broken down—achieve 96% absorption.

 

Same ingredients. Same collagen. Just a format that doesn't require 12 hours of digestion to work.
 

I'd been prescribing the wrong delivery system for 18 years. Not because liquid didn't exist. Because I never questioned whether pills could actually work in dogs' digestive systems.

 

They can't. The biology doesn't support it. And thousands of dogs have suffered while their owners spent money on supplements that were mathematically designed to fail.

I went back through the 138 dogs who DID improve.

 

Found something interesting: 23 had mixed pills with wet food and let it sit 15-20 minutes. The pills partially dissolved before consumption. Inadvertent pre-breakdown.

 

41 had crushed pills into powder mixed with liquid. Again—breaking down the supplement before the dog's system had to.

 

19 had used liquid supplements I'd recommended alongside pills. The liquid had been doing the work. I'd credited the pills.

 

The dogs who improved had accidentally solved the absorption problem. Everyone else was fighting biology with a format that never stood a chance.

 

Here's why format matters more than ingredients:

Pills: Large molecules. Require stomach acid + digestive enzymes + 12-14 hours to break into absorbable size. Dogs digest everything in 4-8 hours. Pills exit mostly intact.
 

Powders: Must dissolve in stomach, then break down. Better than pills, but still require significant digestion time most dogs don't have. Absorption: 25-35%.
 

Liquid Hydrolyzed Collagen: Molecules already broken down to 2000-3000 Daltons (absorbable size). No digestion needed. Goes directly through intestinal walls. Absorption: 96%.
 

It's not complicated. Dogs' digestive systems are fast. Pills are slow. Liquid bypasses the problem entirely.
 

That's why customers see results in 7-14 days with liquid instead of "maybe in 3-6 months" with pills.

 

When your dog's body can actually absorb what you're giving them, improvement happens quickly.

This changes everything about how we should think about supplements.

 

It means:

  • If glucosamine didn't work for your dog, it probably wasn't the glucosamine. It was the format.
  • If you've spent hundreds on pills with no results, you weren't wasting money on bad ingredients. You were using a delivery system your dog's biology can't support.
  • If your vet recommended pills, they probably didn't know about absorption rates. I didn't. Most vets don't. We're not taught digestive bioavailability in vet school.

The dogs suffering right now aren't suffering because supplements don't work.

 

 They're suffering because they're taking supplements in a format their bodies can't use.

After discovering this, I couldn't keep recommending pills in good conscience.
 

I started looking for liquid collagen supplements I could trust. Most were garbage—flavored water with minimal active ingredients, or liquid versions of the same low-quality collagen that doesn't absorb well even in liquid form.

 

Then I found Pawly Liquid Collagen.

 

What made it different:

Hydrolyzed to 2000-3000 Dalton molecular weight (optimal absorption size). Third-party tested at 96% bioavailability in canine studies. Grass-fed, human-grade collagen peptides. No fillers, no artificial flavoring that dogs refuse.

 

I started recommending it to patients three months ago. Started with the toughest cases—dogs who'd failed on multiple pill supplements.

Patricia brought Duke back after four weeks on Pawly.

 

He'd been on premium glucosamine pills for six months with no improvement. 

 

Four weeks on liquid collagen—he was standing without struggle. Walking to the door to greet her. First improvement in eight months.

 

"Why didn't anyone tell me about this sooner?" she asked.

 

Because I didn't know. And most vets still don't.

 

I've now transitioned 47 dogs from pill supplements to Pawly Liquid Collagen. 

 

43 have shown significant improvement within 4-6 weeks. Dogs who'd been on pills for months or years with minimal results.

 

Not because Pawly has magic ingredients. Because dogs can actually absorb it

 

Here's what you need to understand:

If your dog is on pill supplements right now, 77-82% of what you're paying for is being expelled unused. 

You're not helping your dog. You're creating expensive waste.
 

If your dog tried supplements before and they "didn't work"—try the format that actually absorbs. It wasn't the collagen that failed. It was the delivery system.
 

If you're skeptical because you've wasted money before—I understand. I recommended those treatments for 18 years. But the difference between 23% absorption and 96% absorption isn't subtle. 

 

It's the difference between "maybe this will help eventually" and "I can see improvement in two weeks."

Pawly is currently offering Buy One Get One Free because they want skeptical owners to actually try what works.
 

Two bottles. 96% absorption. Results in 7-14 days for most dogs.

 

If your dog doesn't show visible improvement in 30 days, full refund. No questions. Because when absorption actually works, results aren't subtle.

 

This is what I'm recommending to my patients now instead of pills. 

 

Not as an addition to pills. As a replacement for pills that can't work.

 

Your dog has been losing 7-9% of their collagen every year since age 3. Pills couldn't replace what they were losing because your dog couldn't absorb them.

 

Liquid can. 96% absorption means your dog's body finally gets the structural support it's been missing.

SEE WHAT DR. CHEN IS RECOMMENDING TO HER PATIENTS

I've watched hundreds of dogs decline on pill supplements while their owners kept hoping "maybe it just needs more time."

 

It doesn't need more time. It needs a format that works.

 

Dogs don't have time to waste on treatments with 23% absorption rates. 

 

Every month you wait is another month of 7-9% collagen loss their body can't replace with pills that pass through unused.

 

Patricia waited six months on pills. Duke got worse.

 

Four weeks on liquid—he's moving again.

 

You can wait. Or you can try what actually absorbs.

 

The research is clear. The biology is undeniable. Pills don't work in dogs' digestive systems.

Stop buying better ingredients in the wrong format. Start using what your dog's body can actually absorb.

I know what you're thinking right now.

 

"Another vet telling me about another supplement. I've heard this before."

 

You have. And I'm the one who told you. For 18 years, I recommended pills with confidence. Told owners "give it 3-6 months." Watched them spend money on treatments that couldn't work.

 

So why should you believe me now?

 

Because I'm not selling you better ingredients. I'm not claiming Pawly has some proprietary blend that's superior to what you've tried. I'm telling you the format you've been using is biologically incompatible with your dog's digestive system.

 

That's not a sales pitch. That's physiology.

 

Dogs digest food in 4-8 hours. Pills need 12-14 hours to break down. The math doesn't work. It never did.
 

You can verify this yourself. Look up canine digestive transit time. Look up supplement bioavailability in dogs. The research is public. The numbers are undeniable.

 

I'm not asking you to trust me. I'm asking you to trust biology.

THE FORMAT THAT YOUR DOG CAN ACTUALLY ABSORB

Since I started recommending Pawly three months ago, I've received messages I never got in 18 years of prescribing pills.

Linda, 11-year-old Labrador, on glucosamine pills for 14 months - no improvement:

"Week 2 on Pawly: Maggie stood up without whimpering. Week 4: She walked to the car on her own. Week 6: She's playing again. I spent 14 months on pills that did nothing. Two weeks on liquid and I got my dog back."

 

Robert, 9-year-old German Shepherd, tried three different pill brands over two years:

"I was days away from discussing euthanasia. He couldn't stand without help. Started Pawly because I had nothing left to try. Day 9: He stood on his own. Week 3: He walked around the block. I'm crying writing this. He's not dying. He was just depleted and couldn't absorb what I was giving him."

 

Jennifer, 7-year-old Golden Retriever, spent $1,200 on various supplements:

"Everyone told me 'try this brand' or 'try higher doses.' No one told me pills don't absorb. Three weeks on Pawly—her coat is shinier, she's moving better, she has energy again. I wasted a thousand dollars on the wrong format while she suffered."

 

These aren't cherry-picked success stories. This is the pattern.
 

When dogs can actually absorb structural support, their bodies rebuild. Fast. Visibly. Undeniably.

Pills promised this. Pills couldn't deliver it because biology wouldn't allow it.
 

Liquid delivers it because absorption isn't a promise—it's a measured rate. 96%. Not theoretical. Tested.

Here's what Pawly is offering right now:
 

BUY ONE GET ONE FREE

Two months of liquid collagen. 96% absorption. At the price of one month.
 

Why? Because they know what I know: when dogs can actually absorb collagen, results aren't subtle. Owners see improvement. They reorder. They tell other owners.
 

The BOGO isn't generosity. It's confidence.

 

But here's the part that matters:

30-DAY MONEY-BACK GUARANTEE. FULL REFUND. NO QUESTIONS.

 

If your dog doesn't show visible improvement in 30 days, you get every penny back.

 

Not "some improvement." Not "maybe a little better." Visible improvement that you can see in how they move, how they look, how they act.

Because when absorption works, results are obvious. If they're not obvious in 30 days, Pawly doesn't want your money.

Your last chance to protect your dogs wellbeing

Let me show you what you're deciding right now:
 

OPTION A: Keep Using Pills

  • Absorption rate: 18-23%
  • What you're paying for that actually works: $18-23 per $100 spent
  • Timeline for results: "Give it 3-6 months, maybe longer"
  • Likelihood of improvement: Based on my 18 years of data, ~22%
  • What you're actually doing: Hoping your dog is in the 1-in-5 who responds to low absorption rates


OPTION B: Switch to Liquid

  • Absorption rate: 96%
  • What you're paying for that actually works: $96 per $100 spent
  • Timeline for results: 7-14 days for most dogs, visible by week 3-4 for nearly all
  • Likelihood of improvement: Based on my 3 months of data, ~91%
  • What you're actually doing: Giving your dog's body what it's been missing in a format it can use

While you're reading this, your dog is losing collagen.

 

7-9% per year. 0.58-0.75% per month. Roughly 0.02% per day.

 

It sounds small. It's not. It's cumulative. Irreversible without intervention.

 

Every day you wait is another day of structural loss your dog can't replace with pills that don't absorb.

 

By age 8, they've lost 35-45% of their framework. By age 10, they've lost 49-63%. By age 12, they've lost 63-81%.

 

Pills can't stop this because your dog's body can't access what's in pills.

 

Liquid can stop this. Liquid can reverse months or years of depletion. But only if you start now.

 

Not "next month when I finish this bottle of pills." Not "after I try one more thing." Now. Today. While your dog still has structure left to rebuild.

CLAIM THE LIMITED BUY GET ONE FREE OFFER

🚨 PRODUCTION ALERT: 

 

Pawly's liquid hydrolyzation process takes 14-18 days per batch vs 2-3 days for standard pill manufacturing. 

 

They can't scale production fast enough to meet demand from vets now recommending liquid over pills. Current batch selling out faster than they can produce replacements. Buy one get one free pricing being discontinued after this inventory depletes—their margins can't support 2-for-1 at current production costs. 

 

If you're switching from pills to liquid, order now before they're forced to raise prices to sustainable levels.

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