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COLLAGEN IS A SCAM!! At least that's what I thought after giving my dog collagen every single day for six months and watching her allergies get worse anyway. Turns out collagen isn't a scam. But the Amazon collagen I used for three months? Counterfeit garbage with the wrong collagen types that my dog's body couldn't absorb. And the Chewy collagen I switched to for the next three months? "Legitimate" but with such terrible bioavailability it passed straight through her system without reaching her skin. Six months. Every single day. $3,800 in vet bills. And she was still scratching herself bloody. My name is Martha Rodgers. I live in Austin with my husband. We have a dog named Rosie. She's my whole world. The sweetest, most gentle dog you'd ever meet. About two years ago, she started scratching. Not every day at first. Maybe a few times a week. Then it got worse. By month three, she was scratching constantly. Waking us up at night. Hot spots spreading. Ears always infected. Chewing her paws until they bled. I took her to the vet. They said allergies. Gave us Apoquel. It worked for a few months. Then stopped. Cytopoint injections. $80 every four weeks. Helped a little. Then stopped helping too. I started researching. Found articles about collagen deficiency. How dogs lose 7-10% of their skin collagen every year after age 2. How that's why allergies get worse as they age. How the skin barrier breaks down and lets every allergen through. It all made sense. So I went to Amazon—where I could get it fast with Prime shipping—and searched for collagen supplements for dogs. Found one with great reviews. Over 4,000 five-star ratings. "Supports skin and coat health." "Premium collagen for dogs." $34. I ordered it. Started giving it to Rosie every single day. Mixed into her food. Just like the label said. The first few weeks, nothing changed. She was still scratching. Still getting hot spots. By month three, she was getting worse. I thought maybe I'd ordered a bad batch. Or maybe Amazon collagen wasn't the right brand. So I switched. I went to Chewy—where I'd been buying Rosie's food for years—and ordered their collagen supplement. Better reviews. "Veterinarian formulated." $38 for a 2-month supply. I figured Chewy was more reliable than Amazon. More legitimate. Started giving Rosie the Chewy collagen. Every single day. Month four on collagen (one month on Chewy's version): Still scratching. Hot spots spreading to new areas. Month five: Ears constantly infected. Vet put her on antibiotics again. Month six: Scratching so bad she had bald patches. Skin raw and bleeding in spots. I took her back to the vet. "But she's been on collagen for six months," I said. "I've been giving it to her every day. Isn't collagen supposed to rebuild the skin barrier?" The vet looked at me. "Collagen can help, but some dogs just have severe allergies. We might need to try immunotherapy." More medications. More expensive treatments. More bills. I did everything he said. Rosie kept getting worse. I was ready to give up. Then, about a week later, I saw a post in a dog allergy Facebook group. Someone mentioned they'd been using collagen from Amazon but their dog wasn't improving. Someone else replied: "Amazon collagen is garbage. Most of it only has Type I collagen—dogs need Types I, II, AND III to rebuild the skin barrier. And it's not hydrolyzed properly so it doesn't absorb." I didn't even know that was a thing. But I started researching. And my stomach dropped. Most collagen supplements only contain Type I collagen. Dogs need all three types—I, II, and III—to actually repair the skin barrier. And even if they have all three types, the molecules are usually too large to absorb. Over 100,000 Daltons. They pass straight through the digestive system without ever reaching the skin. I looked at the Amazon bottle I'd used for the first three months. "Premium collagen for dogs." Sold by a third-party seller. Not a verified brand. No Certificate of Analysis. No third-party testing. No information about collagen types or molecular weight. I'd given Rosie collagen that probably had only one type—and molecules too large to absorb—for three months. I felt sick. A few days later, still scrolling through that same Facebook group, I saw another post. This one was from a veterinary dermatologist. She'd posted about collagen deficiency in dogs and how most supplements don't actually work. She mentioned one brand specifically: Healthy Petz. Said it was the only one she trusted after testing multiple brands in an independent lab. I found their website. Read everything. Third-party lab testing. All three collagen types. Hydrolyzed under 3,000 Daltons. 90-98% bioavailability. Certificates of Analysis. And then I saw a phone number. I called. A woman answered. I told her everything. About Rosie. About the six months of collagen. About trying Amazon first, then switching to Chewy. About the allergies getting worse. About being ready to give up. I was crying by the end of it. "I don't understand," I said. "I gave her collagen every single day for six months. Why isn't her skin barrier rebuilding? Why is she still scratching?" The woman was quiet for a moment. "I'm so sorry you've been through this. That must be incredibly frustrating." She paused. "Can I ask—you mentioned Chewy. Do you know what types of collagen were in that supplement?" "I don't know. It just said collagen." "Okay. I need to tell you something, and I'm not saying this to make you feel worse—I just want you to understand what probably happened. Most collagen supplements—including the popular ones on Chewy—only contain Type I collagen. But dogs need Types I, II, AND III to actually rebuild the skin barrier. Type I alone isn't enough. It's like trying to build a house with only one type of material." "But... the label said it supports skin health—" "I know. And it might contain some collagen. But if it's missing two of the three types your dog needs, her barrier can't fully rebuild. Allergens keep getting through. The scratching continues." I couldn't breathe. "So even though I gave her collagen every single day for six months..." "Her skin barrier probably wasn't rebuilding properly. The Amazon product was likely underdosed with only one collagen type. And even if the Chewy product had all three types, most aren't hydrolyzed properly—the molecules are too large to absorb. They pass straight through." "But why don't they put that on the label? Why doesn't it say anything about collagen types or absorption?" "Because there's no requirement to. As long as they can say 'collagen' on the label, they can sell it. Most people don't even know to ask about types or bioavailability." I asked her about what Rosie actually needed. "She needs all three collagen types—I, II, and III. And it needs to be hydrolyzed to under 3,000 Daltons so it actually absorbs. That's why we make it in liquid form—no heat processing that destroys the peptides, and 90-98% bioavailability instead of 10-20%." We talked for almost 20 minutes. She didn't push me to buy anything. She just listened. And explained. How most collagen supplements are heat-processed, which destroys the peptides before your dog even eats them. How Healthy Petz uses cold-processing to keep the collagen intact. How it's not just about what's on the label—it's about what actually reaches the skin. "The milligrams don't matter if the bioavailability is terrible. That's what most people don't understand. And that's why dogs on Amazon collagen or Chewy collagen don't improve. The product isn't reaching where it needs to go." After we hung up, I sat there for a long time. Rosie had been on collagen for six months. Three months of Amazon collagen that was probably underdosed with only one type. Three months of Chewy collagen that probably wasn't hydrolyzed properly. Six months of me thinking I was doing the right thing. Six months of her skin barrier starving while I thought I was feeding it. I ordered Healthy Petz that night. Here's what happened: Week 1: Rosie was still scratching, but she slept through the night for the first time in months. Week 2: Scratching reduced by about half. No new hot spots. Week 3: The existing hot spots started healing. She stopped chewing her paws. Week 4: My husband asked what I'd changed. He'd noticed before I even pointed it out. Week 6: Her ears cleared up. Her coat was getting shinier. The bald patches were growing back. Week 8: I realized I couldn't remember the last time I heard her scratch. After six months of nothing on Amazon and Chewy collagen. Eight weeks on the real thing. I'm writing this because I see so many of you doing what I did. Ordering collagen from Amazon because it's cheap and ships fast. Ordering from Chewy because you trust the brand. Looking at the label. Reading the reviews. Thinking you're covered. But labels don't tell you about collagen types. Labels don't tell you about molecular weight. Labels don't tell you about bioavailability. Your dog can be getting collagen every single day that their body only absorbs 10-20% of. Which means their skin barrier is still broken. Allergens are still flooding through. The immune system is still in overdrive. And you think you're fixing it because you're giving them collagen every day. But you're not. You're giving them a form of collagen their body can't use. I gave Rosie collagen for six months. First from Amazon—probably underdosed with only one collagen type. Then from Chewy—legitimate but with such low bioavailability it never reached her skin. She kept scratching. Kept getting worse. Because neither supplement was actually working. Don't make my mistake. If you're going to supplement collagen, don't buy it from Amazon. Third-party sellers are sourcing the cheapest collagen they can find. Wrong types. Not hydrolyzed. Fillers that block absorption. It's not designed to actually work. It's designed to be cheap and get good reviews from people who don't know any better. And don't assume Chewy collagen is good enough just because it's from a legitimate retailer. If it only has one collagen type, or it's not properly hydrolyzed, or the bioavailability is only 10-20%, your dog is absorbing almost nothing. It passes straight through. Use liquid collagen with all three types—I, II, and III. Use collagen that's hydrolyzed under 3,000 Daltons so it actually absorbs. Use collagen that actually reaches the skin instead of passing straight through. Rosie is finally comfortable. After two years of scratching. After six months of useless supplements. After thousands of dollars in vet bills. Eight weeks on the real thing and she's a different dog. If your dog has allergies and you're supplementing collagen from Amazon or Chewy without results—please consider this: What if it only has one collagen type instead of three? What if the bioavailability is so low it's passing straight through without being absorbed? What if six months from now, you're sitting where I was sitting, wondering why the collagen didn't work? Get liquid collagen with all three types and 90-98% bioavailability—not Amazon garbage or low-absorption Chewy brands: shophealthypetz.com/products/liquidcollagen Because Rosie deserved collagen that actually worked. And so does your dog. P.S. Amazon collagen is usually underdosed with only Type I—dogs need Types I, II, AND III. Chewy collagen is legitimate but most brands have terrible bioavailability—it passes straight through without being absorbed. Rosie was on both for six months and kept getting worse. Eight weeks on Healthy Petz and she stopped scratching completely. P.P.S. If your dog is on Amazon or Chewy collagen and not improving, it's not that collagen doesn't work—it's that wrong-type collagen and low-bioavailability formulas don't reach your dog's skin. I learned this after six months of watching Rosie suffer. Don't wait that long to find out.