Glucosamine has been the go-to joint supplement for dogs for decades.
It's in nearly every pet store product and is what most vets suggest. And if you've been giving it to your dog for months with little to show for it, you're not imagining things.
The problem is bioavailability. Synthetic glucosamine is lab-manufactured, and a dog's body doesn't recognize it as food. It treats it as a foreign compound, which means it passes largely unused through the digestive system. You're essentially paying for expensive urine.
This explains why so many owners say the same thing: "We've been giving him glucosamine for 2 years and he's still struggling."
・Synthetic glucosamine isn't absorbed the way real food is
・Studies show it offers little measurable benefit for joint pain
・Most dogs get zero benefit from it — despite owners spending hundreds of dollars
Owners aren't foolish for trusting it. They were misled by an industry that prioritized profit over science. That's exactly why Pluto made the deliberate decision to leave it out entirely.