Derived primarily from collagen-rich animal hides, bones, and connective tissue, gelatin enters US commerce in multiple physical forms — including rectangular or square sheets, granules, and powders — each suited to distinct food, pharmaceutical, or photographic applications. Gelatin derivatives and isinglass (a fish-bladder clarifying agent) fall within the same heading, as do other animal-origin glues not elsewhere specified. Because gelatin destined for food or pharmaceutical use may trigger FDA review at entry, importers should confirm the intended end-use classification before shipment. Classification edge cases arise when gelatin is blended or further processed, potentially shifting it to a downstream heading.

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