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Gelatin is a yellowish, odorless, and nearly tasteless substance that is made by prolonged boiling of skin, cartilage, and bones from animals. It's made primarily from the stuff meat industries have left over â we're talking about pork skins, horns, and cattle bones. Ugh. Related.
The collagen in gelatin does come from boiling the bones and hides of animals processed for their meat (usually cows and pigs). But hooves consist of a different protein, keratin, which can't produce gelatin. To make Jell-O, you need to heat the gelatin in water. Heating breaks the bonds holding the collagen together. Next, the heated water-gelatin solution must be cooled, allowing the collagen strands to rebond in a network, but now with water trapped inside.