No. It's gelatin that is made from the bones of animals and is used to thicken liquids. Gluten, on the other hand, is a protein found in some grains (such as wheat) and many people are allergic to gluten. Gelatin does not contain gluten.
Gelatin comes from collagen, the soft protein that connects skin, bones, muscles, and tendons. It’s the stuff that, for a not-so-small-fee, also gets pumped into faces to reduce wrinkles, puff up the lips, and basically give the skin the same bounce as, well, Jell-O.
But where does the collagen that will eventually become gelatin actually come from? This is where it gets kinda gross.
Collagen is made from animal parts. But we’re not talking porterhouse steaks, here. Once more expensive and desirable parts of the animal have been removed, you’re left with ears, hides, bones, and skin. These discarded pig and cattle parts later become your Grandma’s bright green gelatin mold, or those Jell-O shooters you adored freshmen year of college, (or maybe right now, no judgements).